Angles — practice question

In the diagram, $AB$ is a straight line. The figure places point $A$ on the left and point $B$ on the right along a horizontal straight line. Starting from point $A$, a sloping line rises to a vertex where the interior angle is $80^{\circ}$. From that vertex, another sloping line descends to meet the straight line segment between $A$ and $B$. At that intersection, the angle above the straight line is marked $x^{\circ}$, while the exterior angle on the right-hand side of the straight line is $120^{\circ}$. At point $A$, the angle between the straight line and the sloping line is marked $y^{\circ}$. The diagram is NOT TO SCALE.