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