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 8a - 2a = 9a - 5z - 9 for a in terms of z.
| z + \(\frac{1}{2}\) | |
| -\(\frac{3}{16}\)z + \(\frac{9}{16}\) | |
| 3z + 9 | |
| 9z + 2 |