<item ident="S2-2012" title="S2 | Linear ODE system with elimination | ver. 2012"> <itemmetadata> <qtimetadata> <qtimetadatafield> <fieldlabel>question_type</fieldlabel> <fieldentry>essay_question</fieldentry> </qtimetadatafield> </qtimetadata> </itemmetadata> <presentation> <material> <mattextxml> <div class="exercise-statement"> <p> <strong>S2.</strong> </p> <p>Find the solution to the given system of IVPs.</p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4" alt="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4" title="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4" data-latex="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4"/> </p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1" alt="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1" title="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1" data-latex="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1"/> </p> </div> </mattextxml> <mattext texttype="text/html"><div class="exercise-statement"> <p> <strong>S2.</strong> </p> <p>Find the solution to the given system of IVPs.</p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?2%20%5C,%20%7Bx%7D%20+%20%7Bx'%7D%20=%20-3%20%5C,%20%7By%7D%20%5Chspace%7B2em%7Dx(0)=%204" alt="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4" title="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4" data-latex="2 \, {x} + {x'} = -3 \, {y} \hspace{2em}x(0)= 4"> </p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?-3%20%5C,%20%7By%7D%20+%20%7By'%7D%20=%20-12%20%5C,%20%7Bx%7D%20%5Chspace%7B2em%7Dx(0)=%201" alt="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1" title="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1" data-latex="-3 \, {y} + {y'} = -12 \, {x} \hspace{2em}x(0)= 1"> </p> </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?x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}" alt="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}" title="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}" data-latex="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}"/> </p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}" alt="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}" title="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}" data-latex="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}"/> </p> </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?x=%20e%5E%7B%5Cleft(7%20%5C,%20t%5Cright)%7D%20+%203%20%5C,%20e%5E%7B%5Cleft(-6%20%5C,%20t%5Cright)%7D" alt="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}" title="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}" data-latex="x= e^{\left(7 \, t\right)} + 3 \, e^{\left(-6 \, t\right)}"> </p> <p style="text-align:center;"> <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?y=%20-3%20%5C,%20e%5E%7B%5Cleft(7%20%5C,%20t%5Cright)%7D%20+%204%20%5C,%20e%5E%7B%5Cleft(-6%20%5C,%20t%5Cright)%7D" alt="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}" title="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}" data-latex="y= -3 \, e^{\left(7 \, t\right)} + 4 \, e^{\left(-6 \, t\right)}"> </p> </div> </mattext> </material> </flow_mat> </itemfeedback> </item>