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