a = 5.5 (slider from -10 to 10, step 0.1)
b = 3.1 (slider from -10 to 10)
f(x) = (a * x) + b
c = 1.9 (slider from -10 to 10, step 0.1)
d = 2.5 (slider from -10 to 10, step 0.1)
g(x) = (c * x) + d