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 2a - a = a - 9y + 6 for a in terms of y.
| -4y + 7 | |
| -2\(\frac{1}{3}\)y + \(\frac{1}{3}\) | |
| 9y + 1 | |
| -8y + 6 |