For the figure below, give the following. (a) one pair of angles that form a linear pair
(b) one pair of vertical angles
(c) one pair of angles that are supplementary

The line through points A, B and C is a straight line. ∠1 and ∠2 are supplementary. If two angles form a linear pair, the angles are supplementary. A linear pair forms a straight angle which contains 180º, so you have 2 angles whose measures add to 180, which means they are supplementary.

Step-by-step explanation:

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative