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