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Relation between Variables and Equations

The cost of a...

Question

The cost of a pen is four times the cost of a pencil express the statement as a linear equation in two variables.

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Solution

Cost of pen $= 4 x$
Cost of pencil $= x$
$4 x + x = y$
$5 x = y$
$5 x - y = 0$
WE get, $5 x - y = 0$

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