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 4a + 5a = 8a + 7z + 4 for a in terms of z.
| -3z - 1\(\frac{2}{3}\) | |
| -\(\frac{3}{14}\)z - \(\frac{1}{7}\) | |
| -\(\frac{1}{2}\)z - 1 | |
| -\(\frac{1}{8}\)z + \(\frac{1}{8}\) |