If 2x + y = 3 and x-3y = 5, then y (x-3y) ^ 2 + 2x (3y-x) ^ 2 =?

If 2x + y = 3 and x-3y = 5, then y (x-3y) ^ 2 + 2x (3y-x) ^ 2 =?

y(x-3y)^2+2x(3y-x)^2
=y(x-3y)^2+2x(x-3y)^2
=(y+2x)(x-3y)^2
=3×5^2
=75