Derive the consumer's optimal demand of x and y, respectively, when the budget constraint is px + qy = m and the utility function is x^p + y^p.

What I've done so far :
Deriving with respect to x and y:

px^p-1 

py^p-1

Then:

(px^(p-1))/(py^(p-1)) = (x/y)^(p-1)

I'm lost after that. Please help me with steps