Step-by-step explanation:
Vertical Angles: Angles facing each other.
Example: 6 & 7
Complementary Angles: Angles adding up to 90 degrees / making a right angle.
Example: 9 & 10
Supplementary Angles: Angles adding up to 180 degrees / making a straight line.
Example: 7 & 8
Answer:
3y+7
6+7.2y+−4.2y+1
(7.2y+−4.2y)+(6+1)
a.
b.
c.