Solve for y: 4x + 5y = 9

To solve the equation 4x + 5y = 9 for y, we need to isolate y on one side of the equation.

Here are the steps to do that:

1. Start with the original equation: 4x + 5y = 9.
2. Subtract 4x from both sides to move the 4x term to the right:
   5y = 9 – 4x.
3. Now, to isolate y, divide both sides by 5:
   y = (9 – 4x) / 5.

So the solution is:

y = (9 – 4x) / 5

This equation tells you how y is expressed in terms of x. You can plug in different values for x to find corresponding values for y.