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 5a + 8a = -a - 9z - 4 for a in terms of z.
| -1\(\frac{1}{3}\)z - 1\(\frac{1}{3}\) | |
| -2\(\frac{5}{6}\)z - \(\frac{2}{3}\) | |
| -z + \(\frac{1}{3}\) | |
| -\(\frac{9}{11}\)z - \(\frac{1}{11}\) |