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