I could not be more lost in trying to figure out this problem. How do I solve it?

Determine whether 1 - y = 2x is a direct variation.

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- June 19th 2005, 07:58 AM #1

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- June 19th 2005, 08:59 AM #2
## Direct Variation

When two variable quantities have a constant (unchanged) ratio, their relationship is called a direct variation.

The general form of a direct variation is y = kx, where k is the constant of variation which describes the relationship between variables y and x.

**1 - y = 2x**can be written as**y = 2x + 1**

I beleive that the '**+ 1**' makes the equation**not a direct variation.**A test for checking the situation could be as follows:

If you double x and y also doubles then it is a direct variation. In this case it is not.

- June 19th 2005, 10:10 AM #3

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