5 books and 7 pens together cost ₹ 79, whereas7 books and 5 pens together cost ₹ 77 represent this situation in the form of linear equation in two variables
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Let 1 book be X.
Let 1 pen be Y
By given condition,
5X +7Y =79
7X +5Y =77
Let 1 pen be Y
By given condition,
5X +7Y =79
7X +5Y =77
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