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.)
If b = -9 and z = 1, what is the value of 6b(b - z)?
| 90 | |
| -40 | |
| 540 | |
| 231 |