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 - 8a = -a - 9y + 9 for a in terms of y.
| 13y + 4 | |
| y + 1\(\frac{1}{6}\) | |
| \(\frac{1}{8}\)y - 1\(\frac{1}{8}\) | |
| \(\frac{4}{15}\)y + \(\frac{3}{5}\) |