Which of the sets of ordered pairs represents a function? A= (-5,5), (-2,2), (2,-2) , (5,-5), B= (4,2), (3,-2), (9,4), (11,-3)

b does because the x does not repeat

Step-by-step explanation:

with A it is not a functions because the x does repeat because if you put function a on a graph and you draw which every way it is going whether it is a strait line or not and if your "line" lines up with another line and it the second line goes right through the twice then it is not a function

I hope this helps because i am doing this topic now in class

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

b and c

step-by-step explanation: