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 = -a + 8z + 8 for a in terms of z.
| -z + 1\(\frac{1}{3}\) | |
| -\(\frac{5}{6}\)z - \(\frac{2}{3}\) | |
| -1\(\frac{3}{8}\)z - \(\frac{1}{2}\) | |
| \(\frac{2}{5}\)z + \(\frac{4}{5}\) |