a = -1.1 (slider from -5 to 5, step 0.1)
b = 1.5999999999999999 (slider from -5 to 5, step 0.1)
c = -0.4 (slider from -5 to 5, step 0.1)
d = 0.4 (slider from -5 to 5, step 0.1)
f(x) = ((a * x) + b) / ((c * x) + d)