In Fig., if l1 || l2, what is x + y in terms of w and z?

Given: l1‖ l2
Let m and n be two transversals cutting them
∠w + ∠x = 180o(Consecutive interior angle)
x = 180o – w (i)
z = y (Alternate angles) (ii)
From (i) and (ii), we get
x + y = 180o – w + z
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