It is given that y=ax²-3. express a in terms of x and y.

X^2 - 4x +(4/2^2) + y^2 + 8y + (8/2^2) = -4 + (4/2^2) + (8/2^2)(x + 2)^2 + (y + 4)^2 = -4 + 4 + 16your center is (-2, -4) and the radius is the sqrt of -4 + 4 + 16 which is 4

Letter b hope it

Then why is the question on here if you know the answer

Basic algebra equation. first set up your equation: divide out 9.and now you are left with 2x + 4 = 8.