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 7c - 7c = -c - 9y - 1 for c in terms of y.
| y - 1 | |
| -y - \(\frac{4}{7}\) | |
| -\(\frac{1}{4}\)y - \(\frac{1}{8}\) | |
| \(\frac{11}{14}\)y + \(\frac{4}{7}\) |