<item ident="V2-0001" title="V2 | Linear combinations | ver. 0001"> <itemmetadata> <qtimetadata> <qtimetadatafield> <fieldlabel>question_type</fieldlabel> <fieldentry>essay_question</fieldentry> </qtimetadatafield> </qtimetadata> </itemmetadata> <presentation> <material> <mattextxml> <div class="exercise-statement"> <p> <strong>V2.</strong> </p> <p>Consider the following statement.</p> <ul> <li> The vector <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" alt="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]"/>is not a linear combination of the vectors <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" alt="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]"/>. </li> </ul> <ol type="a"> <li> Write an equivalent statement using a vector equation.</li> <li> Explain why your statement is true or false.</li> </ol> </div> </mattextxml> <mattext texttype="text/html"><div class="exercise-statement"> <p> <strong>V2.</strong> </p> <p>Consider the following statement.</p> <ul> <li> The vector <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-6%20%5C%5C%201%20%5C%5C%207%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D" alt="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]">is not a linear combination of the vectors <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%204%20%5C%5C%20-2%20%5C%5C%201%20%5C%5C%200%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-5%20%5C%5C%200%20%5C%5C%204%20%5C%5C%20-3%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-3%20%5C%5C%201%20%5C%5C%20-4%20%5C%5C%20-1%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Ctext%7B%20and%20%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-2%20%5C%5C%20-2%20%5C%5C%202%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D" alt="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]">. </li> </ul> <ol type="a"> <li> Write an equivalent statement using a vector equation.</li> <li> Explain why your statement is true or false.</li> </ol> </div> </mattext> </material> <response_str ident="response1" rcardinality="Single"> <render_fib> <response_label ident="answer1" rshuffle="No"/> </render_fib> </response_str> </presentation> <itemfeedback ident="general_fb"> <flow_mat> <material> <mattextxml> <div class="exercise-answer"> <h4>Partial Answer:</h4> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\operatorname{RREF} \left[\begin{array}{cccc|c} 4 & -5 & -3 & -2 & -6 \\ -2 & 0 & 1 & -2 & 1 \\ 1 & 4 & -4 & 2 & 7 \\ 0 & -3 & -1 & -2 & -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 & 0 & 0 & 0 & -1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & -1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right]" alt="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 & -5 & -3 & -2 & -6 \\ -2 & 0 & 1 & -2 & 1 \\ 1 & 4 & -4 & 2 & 7 \\ 0 & -3 & -1 & -2 & -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 & 0 & 0 & 0 & -1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & -1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right]" title="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 & -5 & -3 & -2 & -6 \\ -2 & 0 & 1 & -2 & 1 \\ 1 & 4 & -4 & 2 & 7 \\ 0 & -3 & -1 & -2 & -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 & 0 & 0 & 0 & -1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & -1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right]" data-latex="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 & -5 & -3 & -2 & -6 \\ -2 & 0 & 1 & -2 & 1 \\ 1 & 4 & -4 & 2 & 7 \\ 0 & -3 & -1 & -2 & -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 & 0 & 0 & 0 & -1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & -1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right]"/> </p> <ol type="a"> <li> The vector equation <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" alt="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]"/>has no solutions.</li> <li> <p><img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" alt="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]"/> is a linear combination of the vectors <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" alt="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]"/>. </p> </li> </ol> </div> </mattextxml> <mattext texttype="text/html"><div class="exercise-answer"> <h4>Partial Answer:</h4> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Coperatorname%7BRREF%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcccc%7Cc%7D%204%20&amp;%20-5%20&amp;%20-3%20&amp;%20-2%20&amp;%20-6%20%5C%5C%20-2%20&amp;%200%20&amp;%201%20&amp;%20-2%20&amp;%201%20%5C%5C%201%20&amp;%204%20&amp;%20-4%20&amp;%202%20&amp;%207%20%5C%5C%200%20&amp;%20-3%20&amp;%20-1%20&amp;%20-2%20&amp;%20-2%20%5Cend%7Barray%7D%5Cright%5D%20=%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcccc%7Cc%7D%201%20&amp;%200%20&amp;%200%20&amp;%200%20&amp;%20-1%20%5C%5C%200%20&amp;%201%20&amp;%200%20&amp;%200%20&amp;%201%20%5C%5C%200%20&amp;%200%20&amp;%201%20&amp;%200%20&amp;%20-1%20%5C%5C%200%20&amp;%200%20&amp;%200%20&amp;%201%20&amp;%200%20%5Cend%7Barray%7D%5Cright%5D" alt="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 &amp; -5 &amp; -3 &amp; -2 &amp; -6 \\ -2 &amp; 0 &amp; 1 &amp; -2 &amp; 1 \\ 1 &amp; 4 &amp; -4 &amp; 2 &amp; 7 \\ 0 &amp; -3 &amp; -1 &amp; -2 &amp; -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 &amp; 0 &amp; 0 &amp; 0 &amp; -1 \\ 0 &amp; 1 &amp; 0 &amp; 0 &amp; 1 \\ 0 &amp; 0 &amp; 1 &amp; 0 &amp; -1 \\ 0 &amp; 0 &amp; 0 &amp; 1 &amp; 0 \end{array}\right]" title="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 &amp; -5 &amp; -3 &amp; -2 &amp; -6 \\ -2 &amp; 0 &amp; 1 &amp; -2 &amp; 1 \\ 1 &amp; 4 &amp; -4 &amp; 2 &amp; 7 \\ 0 &amp; -3 &amp; -1 &amp; -2 &amp; -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 &amp; 0 &amp; 0 &amp; 0 &amp; -1 \\ 0 &amp; 1 &amp; 0 &amp; 0 &amp; 1 \\ 0 &amp; 0 &amp; 1 &amp; 0 &amp; -1 \\ 0 &amp; 0 &amp; 0 &amp; 1 &amp; 0 \end{array}\right]" data-latex="\operatorname{RREF} \left[\begin{array}{cccc|c} 4 &amp; -5 &amp; -3 &amp; -2 &amp; -6 \\ -2 &amp; 0 &amp; 1 &amp; -2 &amp; 1 \\ 1 &amp; 4 &amp; -4 &amp; 2 &amp; 7 \\ 0 &amp; -3 &amp; -1 &amp; -2 &amp; -2 \end{array}\right] = \left[\begin{array}{cccc|c} 1 &amp; 0 &amp; 0 &amp; 0 &amp; -1 \\ 0 &amp; 1 &amp; 0 &amp; 0 &amp; 1 \\ 0 &amp; 0 &amp; 1 &amp; 0 &amp; -1 \\ 0 &amp; 0 &amp; 0 &amp; 1 &amp; 0 \end{array}\right]"> </p> <ol type="a"> <li> The vector equation <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?x_%7B1%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%204%20%5C%5C%20-2%20%5C%5C%201%20%5C%5C%200%20%5Cend%7Barray%7D%5Cright%5D%20+%20x_%7B2%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-5%20%5C%5C%200%20%5C%5C%204%20%5C%5C%20-3%20%5Cend%7Barray%7D%5Cright%5D%20+%20x_%7B3%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-3%20%5C%5C%201%20%5C%5C%20-4%20%5C%5C%20-1%20%5Cend%7Barray%7D%5Cright%5D%20+%20x_%7B4%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-2%20%5C%5C%20-2%20%5C%5C%202%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D%20=%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-6%20%5C%5C%201%20%5C%5C%207%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D" alt="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="x_{1} \left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] + x_{2} \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] + x_{3} \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] + x_{4} \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right] = \left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]">has no solutions.</li> <li> <p><img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-6%20%5C%5C%201%20%5C%5C%207%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D" alt="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} -6 \\ 1 \\ 7 \\ -2 \end{array}\right]"> is a linear combination of the vectors <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%204%20%5C%5C%20-2%20%5C%5C%201%20%5C%5C%200%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-5%20%5C%5C%200%20%5C%5C%204%20%5C%5C%20-3%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-3%20%5C%5C%201%20%5C%5C%20-4%20%5C%5C%20-1%20%5Cend%7Barray%7D%5Cright%5D%20,%20%5Ctext%7B%20and%20%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7D%20-2%20%5C%5C%20-2%20%5C%5C%202%20%5C%5C%20-2%20%5Cend%7Barray%7D%5Cright%5D" alt="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" title="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]" data-latex="\left[\begin{array}{c} 4 \\ -2 \\ 1 \\ 0 \end{array}\right] , \left[\begin{array}{c} -5 \\ 0 \\ 4 \\ -3 \end{array}\right] , \left[\begin{array}{c} -3 \\ 1 \\ -4 \\ -1 \end{array}\right] , \text{ and } \left[\begin{array}{c} -2 \\ -2 \\ 2 \\ -2 \end{array}\right]">. </p> </li> </ol> </div> </mattext> </material> </flow_mat> </itemfeedback> </item>