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Direct Proportion

In which of t...

Question

In which of the following $x$ and $y$ vary directly with each other. For each direct variation, what constant of variation.
$X$ $2$ $4$ $6$ $8$
$Y$ $- 1$ $2$ $- 3$ $4$

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Solution

X 2 4 6 8
Y -1 2 -3 4
$X = 2 Y = - 1$
$X i s 12 \times Y$ (Direct Variation) $C o n s t a n t = - 2$
$X = 4 Y = 2$
$X i s 2 t i m e s 4$ (Direct variation)
$C o n s t a n t = 2$
$X = 6 Y = - 3$
$X i s - 2 t i m e s 4$ (Direct variation)
$C o n s t a n t = - 2$
$X = 8 Y = 2$
$X i s 2 t i m e s 4$ (Direct variation ) $C o n s t a n t = 2$

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