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 = -2 and y = -7, what is the value of 9a(a - y)?
| 720 | |
| 55 | |
| 27 | |
| -90 |