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