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I am stomped on the following question

Which is greater judging from the number line if $\rm JL = KM.$

a) $\rm JK$

b) $\rm LM$

(Answer : Both are the same)

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I would like to know how they concluded both are same ?

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    $L-J=M-K\Rightarrow L-M=-K+J\Rightarrow M-L=K-J$.2012-08-02
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    @DavidMitra . That makes sense. So on a number line $JL$ can be written as L-J right ?2012-08-02
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    Yes, $5-3 = 2$ as in: $-\stackrel{3}{|}-\stackrel{4}{|}-\stackrel{5}{|}-.$2012-08-02

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Hint:

We have $\rm JL = JK + KL$ and $\rm KM = KL + LM.$ (Exercise: why does these equalities hold?). Equate, simplify, and conclude.