# Thread: parametric equation

1. ## parametric equation

parametric equations

2. Originally Posted by carlasader
parametric equations
(a) Use $\frac{dx}{dy} = \frac{dx/dt}{dy/dt}$.

(b) Get the value of x and y at t = pi/6 => point on normal. Gradient: $m = -\frac{dx}{dy}$ evaluated at t = pi/6 (why?). And you know how to get the equation of a line from a gradient and a known point, right?