How do I do this:

Determine whether the lines L1 and L2 given by the vector equations are parallel, perpendicular, or neither.

L1: r(t) = (-3 + 3t)i + (3 + t)j

L2: r(t) = (4 + 4t)i + (2 - 12t)j

If the lines are not parallel, find their point of intersection.

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This is a practice problem, that we can try to solve before getting to the actual online hw. But due to the fact that I have not had a professor since starting school, I've turned to asking this forums for help, and so far have been the most helpful. Thanks once again