Answer:
9.
4x°=80°[alternate angle]
x=80°/4
x=20°
10.
(6x+1)°=37°[alternate angle]
6x=37°-1°
x=36°/6
x=6°
11.
122°=(6x+2)°[corresponding angle]
6x=122°-2°
6x=120°
x=120°/6
x=20°
12.
(6x+5)°=149°[corresponding angle]
6x=149°-5°
x=144°/6
x=24°
13.
87°=6x+3
87°-3°=6x
x=84°/6
x=14°
14.
(6x+1)°=133°
6x=133°-1°
6x=132°
x=132°/6
x=22°
15.
130°+8x-6=180°[co interior angle]
8x+124°=180°
8x=180°-124°
x=56/8
x=7
16.
50°+x+138°=180°[co interior angle]
x=180°-188°
x= -8°