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