Question

the total cost of 5 pen and 7 notebook is 225 rupee the total cost of 8 pen and 7 notebook of the same type is 255 .find the cost of pen and note book​

Answer 1

Your answer is in the image

Answer 2

Answer:

Cost of each pen is ₹ 3

Cost of each notebook ₹30

Step-by-step explanation:

Let the cost of pen be ₹ x

Let the cost of notebook be ₹y

Case 1

5x+7y = 225 - eq 1

Case 2

8x+7y = 255 - eq 2

Solving by elimination

7y and 7y gets cancelled being same signs and Therefore we will change the signs of lower terms and add

-3x = 0

X = 3 ( therefore cost of each pen is ₹3)

Substitute in eq 1

5x+7y = 225

5(3)+7y = 225

15 + 7y = 225

7y = 210

Y = 30 ( Therefore cost of each notebook is ₹30)

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