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 -4a - 9a = 4a + 6y + 9 for a in terms of y.
| -7y + 4 | |
| 1\(\frac{1}{2}\)y + 3 | |
| -1\(\frac{7}{8}\)y - 1\(\frac{1}{8}\) | |
| y + \(\frac{1}{13}\) |