From the given figure,
x=110∘ [alternate interior angles]
(1 Mark)
Now,
We know that the sum of interior angles on the same side of transversal is 180∘.
As l || m and p is a transversal;
⇒ y+80∘=180∘
⇒y=180∘−80∘⇒y=100∘.
(2 marks)