SOLUTION: 4 pens and 3 erasers cost rs 17,4 erazers and 3 pens cost rupees 18.findthe cost of pen and an eraser

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Hi

4p + 3e = 17

3p + 4e = 18



 12p + 9e = 51

-12p - 16e = -72

    -7e = -21

      e = 3,number of erasers.  p = 2