Answer: y = 90 degrees.
Step-by-step explanation: We are given that the supplementary angle of angle y is equal to 90 degrees. By definition, that means that y is also equal to 90 degrees. The solution would be:
y + 50 degrees + 40 degrees = 180 degrees
y + 90 degrees = 180 degrees
y = 180 degrees - 90 degrees
y = 90 degrees
hope this helps! :)
