Posted by **johnny** on Monday, October 20, 2008 at 5:29pm.

What similarities and differences do you see between functions and linear equations, Are all linear equations functions? Is there an instance when a linear equation is not a function? Create an equation of a nonlinear function and provide two inputs to evaluate.

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**Damon**, Monday, October 20, 2008 at 6:06pm
A straight line, unless vertical, has one and only one value of the dependent variable (y for example) for every value of the independent variable (x for example). It is therefore a function unless it is vertical. Therefore I claim that all linear equations are functions except one of form x = constant.

An easy non-linear function is y = x^2

Here there is one and only one value of y for every value of x so it is a function. You can put in a couple of values of x and find y, for example (0,0) and (3,9).

Notice that x is NOT a function of y in this equation because there are TWO values of x for every y.

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