HELP! Angle Sum Theorem - What does Y equal? WILL GIVE BRAINLIEST!

The sum of the 3 inside angles of a triangle need to equal 180.
Y = 180 - 90 - 48 = 42 degrees.
See attached picture:
Answer:
42 degrees.
Step-by-step explanation:
The triangle containing angle y and 48 degrees is right angled.
So y + 48 = 90
y = 42 degrees.