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 -a + 2a = 5a + 6y + 9 for a in terms of y.
| -8\(\frac{1}{2}\)y - 2 | |
| -\(\frac{1}{2}\)y - 1 | |
| -\(\frac{9}{10}\)y - \(\frac{9}{10}\) | |
| -\(\frac{2}{3}\)y - 1\(\frac{1}{2}\) |