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