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