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