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