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 = -7 and y = 4, what is the value of 9a(a - y)?
| 15 | |
| 144 | |
| 540 | |
| 693 |