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 = a + 7y - 1 for a in terms of y.
| -y - 8 | |
| 2y - \(\frac{1}{8}\) | |
| -\(\frac{2}{11}\)y - \(\frac{9}{11}\) | |
| y + \(\frac{6}{13}\) |