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