Which set of ordered pairs represents a function? A{(0,1), (1, -1),(1,2), (2,1),(-1,3)}
B {(-1,1),(0, -1),(1, 1), (2; -11),(3,3)}
© {(1, -2), (1, -1),(1,0),(1, 2), (1,3)}
D {(0,1),(-1, -1), (2,5),(-3,1),(-1,7)}

Ithink the answer may be -7 by when dividing both sides by -3

I'm a bit puzzled here because they did not provide you with any measures of the other angles, so i am unable to provide a theorem or postulate to support my answer, but i'd say 90 degrees because it looks closer to a right angle than anything.