To determine the relationship between angle 6 and angle 7 in the context of an inclined transversal intersecting two vertical parallel lines (M and N):
- Angle 6 is situated at the upper right corner of the intersection of line N.
- Angle 7 is at the lower right corner of the intersection of line N.
Since these angles lie on opposite sides of the transversal and are between the two lines (M and N), they are classified as alternate interior angles.
Therefore, the correct answer is:
alternate interior angles.