Question

In the figure, if $l_1||l_2$, what x + y in terms of w and z ?

Answer 1

In the figure, $l_1$ || $l_2$

p and q are transversals
$\therefore w+x={180}^0\Rightarrow ={180}^0-w$
(Co-interior angle)
z=y (Alternate angles)
$\therefore x+y={180}^0-w+z$