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 -4a + a = 7a + 3y - 9 for a in terms of y.
| 3y - 8 | |
| -\(\frac{1}{8}\)y - \(\frac{5}{8}\) | |
| -\(\frac{2}{11}\)y + \(\frac{9}{11}\) | |
| -\(\frac{7}{10}\)y - \(\frac{2}{5}\) |