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 -6a - 3a = 7a - 5y + 9 for a in terms of y.
| -2y - 1\(\frac{1}{3}\) | |
| 1\(\frac{1}{7}\)y + \(\frac{2}{7}\) | |
| 1\(\frac{4}{11}\)y + \(\frac{4}{11}\) | |
| \(\frac{2}{13}\)y - \(\frac{9}{13}\) |