If anyone could explain how the following is done without a grapher, it would be greatly appreciated:

Determine if the two lines A and B are parallel, skew, or intersecting. If they are intersecting, find the point at which they intersect.

A: x = 13 + 12t, y = -7 + 20t, z = 11 - 28t

B: x = 22 + 9s, y = 8 + 15s, z = -10 - 21s