please help i dont understand

Given:
A quadrilateral inscribed in a circle.
To find:
The value of x and y.
Solution:
If a quadrilateral inscribed in a circle, then it is known as cyclic quadrilateral and the opposite angles of a cyclic quadrilateral are supplementary angles, it means their sum is 180 degrees.
[tex]5x^\circ+110^\circ=180^\circ[/tex] [Supplementary angles]
[tex]5x^\circ=180^\circ -110^\circ[/tex]
[tex]x^\circ=\dfrac{70^\circ}{5}[/tex]
[tex]x^\circ=14^\circ[/tex]
The value of x is 14 degrees.
[tex]2y^\circ+104^\circ=180^\circ[/tex] [Supplementary angles]
[tex]2y^\circ=180^\circ -104^\circ[/tex]
[tex]y^\circ=\dfrac{76^\circ}{2}[/tex]
[tex]y^\circ=38^\circ[/tex]
Therefore, the value of x is 14 degrees and the value of y is 38 degrees.