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