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