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 -4a - 9a = 3a - 7y + 6 for a in terms of y.
| y - 9 | |
| y - 5 | |
| -1\(\frac{3}{10}\)y - \(\frac{4}{5}\) | |
| -\(\frac{2}{7}\)y - \(\frac{6}{7}\) |