Question

please answer this question ​

Answer 1

Step-by-step explanation:

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Answer 2

Let pen be x and let pencil be y

5x+4y=70

3x+7y=65

Multiply the first equation by 2

10x+8y=140.......(1)

Multiply the second equation by 1

3x+7y=65….......(2)

subtract 2 from 1

solving them we get 7x+y=75.......(3) which then gives y=75-7x

3x+7(75-7x)=65

=>X=10

substituting in the equation we get y= is $5