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March 4, 2015

March 4, 2015

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

- math -
**Damon**, Monday, October 20, 2008 at 6:06pmA 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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