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 y = 1, what is the value of 9b(b - y)?
| -20 | |
| 648 | |
| 200 | |
| -72 |