a = 1 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
c = -1.3 (slider from -5 to 5, step 0.1)
d = 0.7 (slider from -5 to 5, step 0.1)
f(x) = a * x + b
g(x) = c * x + d
h(x) = f(x) * g(x)