SOLUTION: The origin can sometimes be used as the test point, how is this supported?

Question 193372: The origin can sometimes be used as the test point, how is this supported?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

When deciding which side of a line to shade when graphing an inequality, the origin, given that the boundary line does not include the origin, is an excellent choice for a test point. Substitute zeros for both variables in the inequality. If the result is a true statement, shade in the side of the line that includes the origin. Otherwise, shade in the other side.

John

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