N = Point(xAxis)
S = (1, 2)
nx: x(N)
sx: x(S)
sy: y(S)
nn: sx^(2.0) - 2.0 * nx * sx + nx^(2.0)
a: -(sy) / nn
b: 2.0 * sx * sy / nn
c: (nx^(2.0) * sy - 2.0 * nx * sx * sy) / nn
f(x) = a * x^(2.0) + b * x + c
Text1: "f(x) = " + a + "x² + " + b + "x + " + c