m_1 = 1 (slider from -5 to 5, step 0.1)
n_1 = 0.9 (slider from -5 to 5, step 0.1)
a: y = m_1 * x + n_1
A = Intersect(a, yAxis)
B = Intersect(xAxis, yAxis)
n = Segment(A, B)
m = Slope(a)