Inverse relation graphical shape

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I have a few points among two quantities which are inversely related. The points are $(0,20), (1,19)$ and $(5,15)$. I have drawn these points in Matlab but it gives me an inverted triangle which isn't present in the inverse relationship among the two quantities. Clearly stated, if I have two quantities and they are inversely related, what shape should it show me if I were given only three points? Please help me.

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Any three points when plotted on a plane will appear as a triangle.
Inversely related quanties will appear somewhat like the curve y = 1/x.
Points should appear more or less along such a curve. It is up to you to decide, given three points, how the curve may lie. The points will appear as a broken line. Which side of the inverted triangle to remove will require some thought.

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