Prealgebra (7th Edition)

$\angle x, \angle y\ and\ \angle z\ are\ 110^o$
When parallel lines are cut by a transversal, opposite interior angles are equal. $\angle x$ is equal to the $110^o$ angle. Corresponding angles are also equal. $\angle y=\angle x=110^o$. $\angle z$ is opposite $\angle y$ so is also $110^o$.