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 - 3a = 9a + 7y + 8 for a in terms of y.
| -y - \(\frac{4}{5}\) | |
| -1\(\frac{4}{5}\)y + 1 | |
| \(\frac{1}{3}\)y - 1 | |
| y - \(\frac{6}{7}\) |