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 -5a + 7a = 8a + 6y + 9 for a in terms of y.
| 2y + 1\(\frac{3}{4}\) | |
| 2\(\frac{5}{7}\)y - \(\frac{5}{7}\) | |
| \(\frac{1}{13}\)y - \(\frac{9}{13}\) | |
| 1\(\frac{1}{4}\)y - 1\(\frac{1}{4}\) |