The given equation is 4x - 3y = 9. To find the answer, we need to solve for either x or y. Let's solve for y. First, we move 4x to the other side of the equation by subtracting 4x from both sides, which gives us -3y = 9 - 4x. Then, we divide both sides of the equation by -3 to isolate y, resulting in y = (9 - 4x)/-3. Simplifying further, we get y = (4x - 9)/3. Therefore, the answer is 4/3.