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 -6a - 3a = 4a + z + 9 for a in terms of z.
| -\(\frac{2}{9}\)z + 1 | |
| \(\frac{1}{5}\)z + \(\frac{7}{15}\) | |
| -\(\frac{2}{5}\)z - \(\frac{9}{10}\) | |
| \(\frac{7}{8}\)z + 1 |