Answer: With the way you wrote it, I don't know. I'm assuming that it's
. If that's the case, then no it's not linear.
Explanation:
It's not a straight line. Graph it.
It's frustrating seeing questions like yours where the person asking literally does not even think through about their question. Next time, at least try the problem on your own instead of just deciding that you can't do it. This is an extremely easy problem, and I'm guessing you're just copying answers on here. The naivety here is palpable.