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The cost of ball pen is Rs.5 less than...

The cost of ball pen is Rs.5 less than half of the coast of fountain pen. Write this statement as a linear equation in two variables.

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Let us assume the cost of ball pen is Rs.x and fountain pen be Rs.y .
A.T.Q
`x=y/2-5`
`2x=y-10`
`2x-y+10=0`
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