Question

Which of the following does not represent a function?

x −2 0 1 −2 9
y 0 −1 −2 −3 −4

x 3 6 9 12 18
y 2 4 6 8 10

x −3 −1 0 2 4
y −6 −4 −3 −2 −1

x 8 7 4 3 1
y −7 −5 −3 −2 −1

Answer 1

The first one is NOT a function since the x value -2 maps to both 0 and -3 at the same time.

Answer 2

all of them are function, but the first one is not one-to-one function, since in 1-1 function, every x has unique y, and in 1-1 graph, if u draw vertical line, it shouldn't intersect the graph twice, known as vertical line test

Answer 3

The first one isnt a function at all, it doesnt pass the vertical line test.

Answer 4

you're thinking of the horizontal line test onaogh