Question

what value of x would make a o b a line in figure if angle AOC equals to 4 x and angle BOC = 2x + 30 degree?

Answer 1

Straight line has 180 degrees
X= 15 degree

Answer 2

angle Boc + angle Coa =180 (linear pair)
6x+30 +4x=180
10x=180-30
10x= 150
x=150 /10
x=15