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 - 8a = a - 8y + 8 for a in terms of y.
| y + 8 | |
| -5y - 1\(\frac{1}{2}\) | |
| -3\(\frac{2}{3}\)y + 2\(\frac{2}{3}\) | |
| y + 5 |