represent the situation algebraically and graphically 5 books and 7 pens together cost rupees 79 whereas 7 books and 5 pens together cost ru

Question

represent the situation algebraically and graphically 5 books and 7 pens together cost rupees 79 whereas 7 books and 5 pens together cost rupees 77

hey mate I want this in graphically and Algebraically solved ​

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Ximena 6 days 2021-09-13T16:06:55+00:00 1 Answer 0 views 0

Answers ( )

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    2021-09-13T16:08:38+00:00

    Let the cost of 1 book =x

    Let the cost of 1 book =xAnd the cost of 1 pen =y

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=79

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations24y=168

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations24y=168y=7

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations24y=168y=7x=6

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations24y=168y=7x=6Total cost of 1 book and 2 pens =x+2y=

    Let the cost of 1 book =xAnd the cost of 1 pen =y5x+7y=797x+5y=77Equation (1) × 7 : 35x+49y=79×7Equation (2) × 5 : 35x+25y=77×5Subtract two equations24y=168y=7x=6Total cost of 1 book and 2 pens =x+2y=6+14=20

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