five books and seven pens together cost RS 79 whereas 07 books and 05pens together cost RS 77. Represent this situation in the form of linear equation in two variables.
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5x+7y=79
7x+5y=77
....................
7x+5y=77
....................
Answered by
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let the cost of each book be X and cost of each pen be rupeesY
5x+7y =79
7x+5y =77
5x+7y =79
7x+5y =77
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