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 + 6a = 5a - 3z - 9 for a in terms of z.
| -\(\frac{1}{6}\)z + \(\frac{1}{2}\) | |
| -\(\frac{4}{13}\)z - \(\frac{5}{13}\) | |
| -1\(\frac{1}{2}\)z + 1\(\frac{1}{8}\) | |
| \(\frac{9}{10}\)z + \(\frac{9}{10}\) |