A = (-43, 0)
B = (43, 0)
C = (0, 75)
b = 74 (slider from 50 to 100, step 1)
a = -0.055 (slider from -0.07 to -0.03, step 0.001)
I_1 = (-41.47409663360678, -13.679633003829053)
I_2: (45.4, y(I_1))
I_4: (-41.4741, 76.2)