Author: m@ths et tiques 2012

x(A)

a = 0.9 (slider from -10 to 10, step 0.1)
b = 1.5 (slider from -10 to 10, step 0.1)
f(x) = a * x + b
A = Intersect(f, yAxis, 1)
a_1 = Slope(yAxis)
B = Point(f)
C = Point(f)
c = Line(B, C)
a_2 = Slope(c)