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 ​

Answer 1

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