Question

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

Answer 1

A function is a set of ordered pairs in which no two ordered pairs have the same first number.

Answer 2

so C wouldn't be right

Answer 3

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.

Answer 4

How do i find the ordered pairs

Answer 5

In choice B, the ordered pairs are given.

Answer 6

so is it D ?

Answer 7

yes

Answer 8

Thank youuuu . You were very helpful !!!