Question

If 2 pencils and 3 eraser together cost 9 rupees how much will 1 eraser and 1 pencil cost show by simple method

Answer 1

Step-by-step explanation:

$Let \: the \: cost \: of \:1 \: pencil \: and \: 1 \: eraser\: to \: be \: x \: and\: y \\ \\ So, \: \: \: \: 2x + 3y = 9 \\ \\ Now \: \: \: \: \: \: cost \: of \: 1 \: pencil \: = \frac{9 - 3y}{2} \\ Similarly \: \: \: \: \: \: cost \: of \: 1 \: eraser \: = \frac{9 - 2x}{3}$

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