y=mx+b

g(x) = (0.5 * x) + 2
O: (0 | 0)
x1 = 2 (slider from -5 to 5)
x2 = 3 (slider from -5 to 5)
X = Point(g)
Text1: "1 \cdot (\underbrace{" + (LaTeX[x(X)]) + "}_{x_1})- 2 \cdot (\underbrace{" + (LaTeX[y(X)]) + "}_{x_2})= -4"