Angle a and angle y are complementary. angle x is supplementary to a 128° angle. what are the measures of angle x and angle y?

So a complementary angle is one that, added up to another, is equal to 90º.
A supplementary angle is the same but instead if adding up to 90º, it adds up to 180º. First to get x, we will subtract 180 - 128 = 22.
So angle x is 22º.
Then to get y we will subtract 90 - 22 = 68.
Angle y is 68º.
Hope this helps!