Use the diagram for questions 7 - 9.

7: what is the relationship between the two angles?
a-complementary
b-linear pair
c-vertical angles

8: solve for x.
a-x = 51
b-x = 96
c-x = 102
d-x = 39

9: what rule applies to the two angles?
a-they add up to 90
b-they are congruent (equal).
c-they add up to 180

7. A

8. A

9. A

Step-by-step explanation:

Two angles are Complementary when they add up to 90 degrees. As you can see from the diagram angles x° and (x-12)° add up to right angle (90° angle), then the correct choice is complementary angles.

Thus,

Actually, the rule is described in the definition: they add up to 90 degrees.

third one

Step-by-step explanation: