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