If $a @ b$ is defined as $a @ b$ = $3a - 3b$, what is the value of $3 @ 5$?
To evaluate $3 @ 5$, I need to plug in $a = 3$ and $b = 5$ into the definition of $a @ b$. So I get $3 @ 5$ = $3(3) - 3(5)$. Simplifying, I get $9 - 15$. This is $-6$. 