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 -5a + 9a = -a - y + 7 for a in terms of y.
| 10y + 7 | |
| 5y - 5 | |
| 2\(\frac{1}{2}\)y - 1\(\frac{3}{4}\) | |
| -\(\frac{1}{3}\)y - \(\frac{1}{2}\) |