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 + 7a = -2a + 7y + 4 for a in terms of y.
| y - \(\frac{4}{7}\) | |
| -\(\frac{1}{15}\)y + \(\frac{7}{15}\) | |
| 6y - 3 | |
| 3y + 4 |