Find the values of the unknows $x,y,z$

Question

$\begin{array}{1 1} \angle x= \angle z =80^{\circ} ; \angle y=100^{\circ} \\ \angle x= \angle y =80^{\circ} ; \angle z=100^{\circ} \\\angle x= \angle y =74^{\circ} ; \angle z=94^{\circ} \\\angle x= \angle y =75^{\circ} ; \angle z= 94^{\circ} \end{array} $