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 -9a - 2a = 6a + 6y + 9 for a in terms of y.
| -\(\frac{6}{7}\)y + \(\frac{2}{7}\) | |
| -2\(\frac{1}{5}\)y + 1\(\frac{1}{5}\) | |
| -\(\frac{8}{15}\)y - \(\frac{3}{5}\) | |
| \(\frac{3}{7}\)y - 1 |