Question

Observe the table given below and in each one find whether $x$ and $y$ are proportional:

$x$	$5$	$7$	$9$	$15$	$18$	$25$
$y$	$15$	$21$	$27$	$60$	$72$	$75$

Answer 1

Here we are checking the ratio i.e.

$5/15=1/3$

$7/21=1/3$

$9/27=1/3$

$15/60=1/3$

$18/72=1/3$

$25/5=1/3$

Since above given numbers are equally divisible.

$\therefore xandy$ are directly proportional.