Question

If the cost of 2 pencils and 3 erasers is Rs. 9 and the cost of 4 pencils and 6 erasers is Rs. 18. Find the cost of each pencil and each eraser.

Answer 1

Answer:

Let cost of pencils =x

cost of erasers=y

case -1:- 2x+3y=9

case-2:-4x+6y=18

subtract 1 from 2

then we get 2x+3y=9

then substitute 3 in x place and 1 in y place

so 2(3)+3(1)=9

so cost of erasers is 1. and pencils is 3