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Which of the tables below could represent a linear function?

1.

$x$	0	10	20
$f(x)$	19	69	119

2.

$x$	0	2	4
$f(x)$	-13	-17	-9

3.

$x$	0	5	10
$f(x)$	-3	-13	-23

4.

$x$	5	7	9
$f(x)$	40	52	64

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