Question

In the diagram below DE is parallel to XY what is the value of y

Answer 1

Option A.
`80\°`

Explanation:

we know that

If DE is parallel to XY

then

`m< y+100\°=180\°` ------> by supplementary angles

`m< y=180\°-100\°=80\°`

Answer 2

y = 180 - 100

y = 80

the answer is 80