y0A = Point(yAxis)
y0B = Point(yAxis)
kA = 0.5 (slider from -5 to 5, step 0.1)
kB = -1 (slider from -5 to 5, step 0.1)
a: y = y(y0A) + (kA * x)
b: y = y(y0B) + (kB * x)
Intersez = Intersect(a, b)