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 + 4a = 9a + 2y + 6 for a in terms of y.
| y - 9 | |
| \(\frac{1}{5}\)y - \(\frac{3}{5}\) | |
| 1\(\frac{5}{6}\)y + 1\(\frac{1}{3}\) | |
| -1\(\frac{1}{3}\)y + 1\(\frac{2}{3}\) |