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Belle E.

asked • 08/23/17

Which of the following expressions represents a function?

{(1, 2), (4, –2), (8, 3), (9, –3)}
 
y2 = 16 − x2
 
2x2 + y2 = 5
 
x = 7

Carol H.

tutor
I disagree with Andy. As I said, x = 7 is the equation of a vertical line. So, you have an infinite number of y-values that have 7 as their x-coordinate. So, only the first answer is a function.
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08/23/17

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