a = -1 (slider from -5 to 5, step 0.1)
f(x) = (a * x)
b = 0.9 (slider from -5 to 5, step 0.1)
c = 1.5 (slider from -5 to 5, step 0.1)
g(x) = (b * x^(2)) + c
s(x) = f(x) + g(x)
P = Point(xAxis)
d = OrthogonalLine(P, xAxis)
F = Intersect(f, d)
G = Intersect(g, d)
S = Intersect(s, d)
e = Integral(f, 0, x(P))
h = Integral(g, 0, x(P))
i = Integral(s, 0, x(P))
Text2: "\int_0^b (f(x) + g(x))dx = " + (LaTeX[i]) + ""
Text1: "\int_0^b f(x) dx + \int_0^b g(x) dx = " + (LaTeX[e]) + " + " + (LaTeX[h]) + " = " + (LaTeX[e + h]) + ""