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Plot a line graph for the variables x an...

Plot a line graph for the variables `x` and `y` , where `y` is three times `x`, i.e. the equation is `y=3x`.
Using the graph , find the value of
`(i) y`, when `x=5` `(ii) x`, when `y=18`

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RS AGGARWAL-LINE GRAPHS AND LINEAR GRAPHS-Exercise 23
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