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 = -6a - 9z + 7 for a in terms of z.
| -16z + 7 | |
| 5z + 2 | |
| -5\(\frac{1}{2}\)z + 1\(\frac{1}{2}\) | |
| -1\(\frac{2}{5}\)z - \(\frac{1}{2}\) |