Which of the following expressions represents a function? a) x2 + y2 = 9 b) {(4, 2), (4, –2), (9, 3), (9, –3)} c) x = 4 d) 2x + y = 5

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Which of the following expressions represents a function? a) x2 + y2 = 9 b) {(4, 2), (4, –2), (9, 3), (9, –3)} c) x = 4 d) 2x + y = 5

Mathematics
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A function is a set of ordered pairs in which no two ordered pairs have the same first number.
so C wouldn't be right
No it couldn't be a function because all x values would be 4 so all the ordered pairs would have the same first number.

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Other answers:

How do i find the ordered pairs
In choice B, the ordered pairs are given.
so is it D ?
yes
Thank youuuu . You were very helpful !!!

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