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 + 9a = a - 8z - 9 for a in terms of z.
| -4\(\frac{1}{4}\)z - 2\(\frac{1}{4}\) | |
| -\(\frac{2}{11}\)z + \(\frac{6}{11}\) | |
| -\(\frac{4}{7}\)z + 1\(\frac{1}{7}\) | |
| \(\frac{9}{10}\)z - \(\frac{3}{10}\) |