Determine whether the relation is a function: 5 stars to best answer

{(-4, -1), (-2, -9), (1, 3), (7, 5)}

FIRST BEST ANSWER GETS 5 STARS <3

Yes, because no two y's are matched with one x. Because then you would have two points for the same x, which fails the vertical line test. The vertical line test states that in order to be a function you must be able draw a vertical line across a graph anywhere and only one point will interact with that vertical line. If more than one does, then it cannot be a function.
Gooood(: ?

yeahhh, no problem(:

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Yes it is a function all real numbers are matched with one range.