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Help me understand please.

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I own a mix of chickens and pigs.

There are 20 animals altogether >!( c + p = 20 )!<

The animals have a total of 70 legs >!( 2c + 4p = 70 )!<
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Figuring out both the height and distance of an object far away by taking two measurements of the apparent height and angle of elevation.

Any situation where there are two things you don't know and can't measure directly, but where you're able to obtain two pieces of information about those two things.
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There are many geometric situations where this occurs. Say you are building a box from a sheet of cardboard of limited size. You have a specific volume that you want the box to be. Your system of two equations will use the length and width of the box.

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