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 a + 7a = 7a + 3y - 9 for a in terms of y.
| -1\(\frac{3}{5}\)y - 1\(\frac{4}{5}\) | |
| -\(\frac{1}{16}\)y - \(\frac{9}{16}\) | |
| \(\frac{2}{3}\)y + 1\(\frac{1}{2}\) | |
| 3y + 4 |