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In what ratio is the line joining $(4,5)$ and $(1,2)$ is divided by the y-axis?

The solution given in my module assumed the ratio to be $K:1$,this might be very trivial but I can't convinced myself why the consequent is assumed to be $1$?

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    You can always assume it to be 1 ($K$ will be then just not necessarily a whole number).2011-03-25
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    @Fabian:Got it! Thanks :-)2011-03-25
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    The line segment from $(4,5)$ and $(1,2)$ does not cross the $y$-axis.2011-03-25

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