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 - 2a = 7a - 8y - 4 for a in terms of y.
| -6y - 9 | |
| -1\(\frac{4}{7}\)y - 1\(\frac{2}{7}\) | |
| \(\frac{2}{5}\)y + \(\frac{4}{15}\) | |
| -y - \(\frac{3}{5}\) |