4209.sagews

var("a b")

(a, b)

implicit_plot(b^2-2*a*b+1 , (a, -10, 10), (b, -10, 10) )

var ('a b c s')

(a, b, c, s)

s = 10
p1 = implicit_plot3d(a*c -b^2 == -1 , (a, -1, 10), (b, -10, 10), (c, -1, 10), color='yellow')
p2 = implicit_plot3d(2*b == c , (a, -1, 10), (b, -10, 10), (c, -1, 10), color='red')
p3 = implicit_plot3d(a == c , (a, -1, 10), (b, -10, 10), (c, -1, 10), color='blue')
p4 = implicit_plot3d(b == 0 , (a, -1, 10), (b, -10, 10), (c, -1, 10), color='green')

show(p1+p2+p3+p4)