Hello again, Help!

Let x=x0 + tv be a line in Rn and let T: Rn ->Rn be a linear opeartor on Rn. What kind of geoemtric object is the image of this line under the operator T? Explain our reasoning.

The geometric object is what??? I don't quite understand linear operator. I want to say it is a line just because it sates it anyway but I know I am missign something. Thoughts???