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 + 9a = 6a + 5z + 4 for a in terms of z.
| 2z - 2 | |
| 2\(\frac{1}{2}\)z + 3\(\frac{1}{2}\) | |
| 2z + 6 | |
| -9\(\frac{1}{2}\)z + 1 |