4 lines are shown. 3 lines intersect and extend from one point forming 2 angles. The top angle is labeled 1 and the bottom angle is labeled 2. A fourth line intersects all 3 lines. When it intersects the middle line, it forms 4 angles. Clockwise, from the top, the angles are 3, 6, 5, 4. When it intersects the third line, it forms 4 angles. Clockwise, from the top left, the angles are 7, 8, blank, blank.
Which angle pairs are supplementary? Check all that apply.
∠1 and ∠2
∠4 and ∠3
∠4 and ∠5
∠7 and ∠5
∠3 and ∠6