Question

Angle AOC and Angle BOC form a linear pair .a-2b= 30 degree, what is a and b

Answer 1

a+b=180
a-2b=30
subtracting
3b=150
b=50
a =a-2×50=30
a-100=30
a=100+30
a=130

Answer 2

a+b=180
a-2b=30
3b=150
b=50
a+50=180
a=180-50
a=130