<|system|>
If $f(x) = 3x + 1$, what is $f(3)$?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
To find $f(3)$, I need to plug in $x = 3$ into the function definition and simplify. So, $f(3) = 3(3) + 1 = 9 + 1 = 10$. 