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 - 3a = 4a - y - 7 for a in terms of y.
| -2y + 3\(\frac{1}{2}\) | |
| \(\frac{2}{5}\)y - 1\(\frac{2}{5}\) | |
| 16y - 9 | |
| y + 1 |