Question

If angle a and angle b are vertically opposite to aangles and a = 100 and b =2x+70, find the value of x

Answer 1

Answer:

a=b

100= 2x+70

100-70=2x

30=2x

30/2=x

15= x

Answer 2

Answer:

x = 5

Step-by-step explanation:

sum of vertically opposite angle is always 180

100 + 2x +70 = 180

170 + 2x = 180

2x = 180 - 170

2x = 10

x = 10 / 2

x = 5