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 -7a + 9a = 8a - 7y - 4 for a in terms of y.
| -\(\frac{1}{4}\)y + \(\frac{3}{16}\) | |
| 4\(\frac{1}{2}\)y - 2\(\frac{1}{2}\) | |
| 1\(\frac{1}{15}\)y + \(\frac{4}{15}\) | |
| 12y - 9 |