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The relation between two variables, x and y, is linear if the expression can be expressed in the form of y = ax + b, where a and b are constants.

Any higher order terms will render the relation non-linear. For example,

y = x^2

y = sqrt (x)

So are the following:

y = log (x)

y = exp (x)

You get the idea.

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Q: What are nonlinear relationships?
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Related questions

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