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