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 - 7a = a - 9z + 8 for a in terms of z.
| 1\(\frac{4}{5}\)z - 1\(\frac{3}{5}\) | |
| 3\(\frac{1}{2}\)z + \(\frac{1}{2}\) | |
| \(\frac{5}{9}\)z + 1 | |
| -\(\frac{1}{4}\)z + 1 |