Answer:
y=42
Step-by-step explanation:
The sum of the angles of a triangle add to 180
y+ 48+ 90 = 180
The third angle is 90 because supplementary angles add to 180 and the other side is a 90 degree angle, which makes that angle equal to 90
y+ 48+ 90 = 180
Combine like terms
y +138 = 180
Subtract 138 from each side
y+138-138 = 180-138
y =42
Answer:42
Step-by-step explanation:
It is 42 because the triangle shares the same line as the other therefore they both have right angles. So you just add 90 + 48 then 180- (90+48) =42
