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 -3c - 9c = -c - 5y - 4 for c in terms of y.
| -2y + 2 | |
| y - \(\frac{1}{9}\) | |
| \(\frac{1}{5}\)y - \(\frac{7}{10}\) | |
| y - \(\frac{8}{9}\) |