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