which of the following tables represents a function that is proportional

Question

function 1:
x y
1 2
2 4
3 6

Function 2

x y
1 2
2 3
3 4

Answer 1

Function 1 represents a proportional function because as x doubles, y also doubles (e.g. x=1, y=2; x=2, y=4; x=3, y=6).

Function 2 does not represent a proportional function because as x increases by 1, y does not increase by the same amount each time (e.g. x=1,y=2; x=2,y=3; x=3,y=4).