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 -3a + 6a = a - y + 9 for a in terms of y.
| -13y + 6 | |
| -\(\frac{3}{7}\)y - \(\frac{5}{7}\) | |
| 1\(\frac{7}{8}\)y + \(\frac{7}{8}\) | |
| 1\(\frac{3}{4}\)y - 2\(\frac{1}{4}\) |