What is the Quasilinear equation of parabola y = - 1 / 8 * x ^ 2 To solve the problem process

What is the Quasilinear equation of parabola y = - 1 / 8 * x ^ 2 To solve the problem process

x^2=-8y
The Quasilinear equation: x ^ 2 = 2PY, the Quasilinear equation is y = - P / 2
So the Quasilinear equation is y = 2