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 a = 3 and y = -7, what is the value of 9a(a - y)?
| -4 | |
| -495 | |
| 45 | |
| 270 |