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 2a - a = 9a + 2y + 8 for a in terms of y.
| -19y + 4 | |
| -\(\frac{3}{7}\)y - 1\(\frac{1}{7}\) | |
| -1\(\frac{1}{2}\)y - 1\(\frac{1}{2}\) | |
| -\(\frac{4}{7}\)y + 1\(\frac{2}{7}\) |