This question, at first, may seem quite confusing. However, this problem can be simplified by just analyzing the triangle with "y" in it.
It is given that one angle of the triangle is 48 degrees. The other interior angle must be 90 degrees since the angle adjacent to that is a right angle, and supplementary angles add up to 180 degrees.
Thus, we have a triangle with angles of 90 degrees, 48 degrees, and y degrees. These must all add up to 180 because this is a triangle.
[tex]y+90+48=180[/tex]
Subtract both sides by 90 and 48
[tex]y=42[/tex]
Hope this helps and have an awesome day! :)
