a = 1 (slider from -5 to 5, step 0.05)
b: 0
c: 0
f(x) = (a * abs(x + b)) + c
szöveg1: "f(x)=" + (LaTeX[f]) + ""
v = Vector((0, 1))
n = Vector((1, 0))
d = Line((0, c), n)
e = Line(((-b), 0), v)