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 6c + 7c = 7c - 6y - 1 for c in terms of y.
| 13y + 1 | |
| -\(\frac{1}{9}\)y - \(\frac{4}{9}\) | |
| 1\(\frac{4}{9}\)y - \(\frac{7}{9}\) | |
| -\(\frac{8}{13}\)y + \(\frac{9}{13}\) |