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Describe the relationship between the curves $|x| + |y| = 1$ and $|x| + |y-a| =1$, where $a>0$ is a constant.

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    hint $t\mapsto t - a$ is a shift on $a$2012-05-12
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    Have you tried drawing them on graph paper? That might suggest something.2012-05-12
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    [This](http://www.wolframalpha.com/input/?i=plot%20%7Cx%7C%2B%7Cy%7C%3D1%20%26%26%20%7Cx%7C%2B%7Cy-1%7C%3D1&t=crmtb01) might help.2012-05-12

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