X + y = z (constant) - what variation is that?

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SUMMARY

The equation x + y = z, where z is a constant, represents neither direct nor inverse variation. Direct variation is exemplified by the equation x*z = y, while inverse variation is shown through x*y = z. In the context of the original equation, addition does not establish a proportional relationship, which is essential for defining variation types.

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I have the equation x + y = z. Z is a constant. What type of variation is expressed here?

An example of direct variation is x*z = y.
An example of inverse variation of x * y = z.
In both examples, z is a constant.

So what's the answer?
 
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Direct and indirect variations are essentially proportions, right? How are you using addition?
 
There is no "proportion" here.
 

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