Question

A merchant sold 5 pens and 3 pens for 75 rupees .Next days he sold 4 pens and 7 pencils for 83 rupees at same rate.whag is the price of a pen?and price of a pencil?
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Answer 1

Step-by-step explanation:

5x+3x=75-1st eqn

4x+7y=83-2nd eqn

75-3x=5x

if 5x=75-3x then 7x is 7(75-3x)

then ...I dont know this much only I remember