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 c - 6c = 8c + y - 9 for c in terms of y.
| -y + 1 | |
| -\(\frac{1}{4}\)y - \(\frac{3}{16}\) | |
| \(\frac{1}{10}\)y + \(\frac{9}{10}\) | |
| -y + 1\(\frac{2}{7}\) |