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 a + 8a = 2a - 2z + 9 for a in terms of z.
| 10z - 9 | |
| \(\frac{4}{5}\)z + \(\frac{3}{10}\) | |
| 2\(\frac{2}{3}\)z - 1\(\frac{2}{3}\) | |
| -4z + 2 |