You can put this solution on YOUR website! Complementary Angles are 2 angles thats sum is 90º
Supplementary Angles are 2 angles thats sum is 180º
The complement of your x is 90-x
The supplement of x is 180-x
The supplement of y is 180-y
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The supplement of (x+y) is :
180-(x+y)
*Note- I am a little bit confused by the second part of your question. I don't know if you mean what is the supplement of (x+y), or the supplement of x, and the supplement of y. So I gave you both answers.