According to given diagram:
As per the theorem of angles the opposite angle between two parallel lines are measured same so:
[tex]\angle x=43^{\circ}[/tex]
Now:
[tex]\begin{gathered} \angle b+75=180 \\ \angle b=105^{\circ} \end{gathered}[/tex]
Now in upper triangle:
[tex]\begin{gathered} \angle y+43+105=180 \\ \angle y=180-43-105 \\ \angle y=32^{\circ} \end{gathered}[/tex]
