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 -3a - 9a = -6a + 6y - 6 for a in terms of y.
| 5y - 2 | |
| -5y + 7 | |
| -1\(\frac{5}{9}\)y + \(\frac{4}{9}\) | |
| y - 1 |