Answer:
∠2 and ∠6
Explanation:
Supplementary means that the angles added are a total of 180°.
∠5 and ∠8 are supplementary because they form a line, and a line is 180°.
∠1 and ∠2 are supplementary because they also form a line.
∠4 and ∠5 are supplementary because they are same side interior angles, and same side interior angles are always supplementary.
Only ∠2 and ∠6 are not supplementary because they are corresponding angles, and corresponding angles are congruent, not supplementary.