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 - 9a = 2a + 4y + 9 for a in terms of y.
| y + \(\frac{7}{10}\) | |
| 6y + 4 | |
| 13y + 9 | |
| -\(\frac{1}{3}\)y + 1\(\frac{1}{3}\) |