Question

In which of the following, $x$ and $y$ vary directly with each direct variation, state the constant of variation.

$x$	$2$	$4$	$6$	$8$
$y$	$-1$	$-2$	$3$	$4$

Answer 1

x	2	4	6	8
y	-1	-2	3	4

$y=cx\Rightarrow \frac{y}{x}=c$

$i)\frac{-1}{2}=c$

$ii)\frac{-2}{4}=c$

$\frac{-1}{2}=c$

$iii)\frac{3}{6}=c$

$\frac{1}{2}=c$

$iv)\frac{4}{8}=c$

$\frac{1}{2}=c$