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