When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
Solve 9a - 9a = -7a + 4y + 9 for a in terms of y.
| 3\(\frac{1}{2}\)y - 2\(\frac{1}{2}\) | |
| y + 4 | |
| \(\frac{13}{16}\)y + \(\frac{9}{16}\) | |
| \(\frac{1}{2}\)y + \(\frac{1}{2}\) |