Question

I won't the answer like this I will give it with question ok. Question eg:-The price of 7 notebooks and 8 pens is 290 rupees. The price of 2 notebooks and 9 pens is 150 rupees. What is the price of notebook ? What is the price of a pen? answer eg:- Let the price of notebook be 'x'. Let the price of pen be 'y'. 7x + 8y= 290-------(1) 2x + 9y= 150----------(2) equation (1)×2, 2×7x+2×8y= 2×290= 580-------(3) equation (2)×7, 2×7x + 7×9= 7×150= 1050-----------(4) 7x+8y= 290---------(1) 7x+8×10 = 290 7x+80= 290 7x= 290—80 7x= 210 x=210/7 = 30. original question:- The price of 3 pens and 5 pencils is 54 rupees. The price of 6 pens and 7 pencils is 90 rupees. What is the price of a pen? What is the price of a pencil?​

Answer 1

Step-by-step explanation:

pencils is 100 I guess it is

Answer 2

Answer:

pen = 8 rupees and pencil = 6 rupees

Step-by-step explanation:

3pens+5pencils = 54------>1

6pens+7pencils = 90------>2

multiply the first equation by 2 and subtract 1-2

6pens+10pencils = 108

- 6pens-7pencils= -90

3pencils = 18

pencil = 6 rupees

for finding out pen cost we should substitute pencil cost in any of the 2 two equations

3pens+5*6=54

3pens=24

pen = 8 rupees