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 = 7a - 9z + 6 for a in terms of z.
| 2\(\frac{1}{5}\)z + \(\frac{2}{5}\) | |
| 1\(\frac{1}{4}\)z - \(\frac{1}{2}\) | |
| 3z - 2 | |
| \(\frac{7}{13}\)z - \(\frac{3}{13}\) |