Let us consider Example 2 in Section 3.3, i.e., 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.

Explanation

cost of 1 pencil`x`rs

cost of 1 eraser`y `rs

acc to question

`2x+3y=0` eqn(1)

`4x+6y=18` eqn(2)

`6y=18-4x`

`y=(18-4x)/6`

putting it in eqn (1)

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