SOLUTION: Explain why a point on the boundary line can not be used as a test point when grapging a linear inequality in two variables? provide an example.

Algebra ->  Linear-equations -> SOLUTION: Explain why a point on the boundary line can not be used as a test point when grapging a linear inequality in two variables? provide an example.      Log On


   

Question 549947: Explain why a point on the boundary line can not be used as a test point when grapging a linear inequality in two variables? provide an example.
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Points on the boundary line represent the equality cases, or where the two expressions you are comparing are equal. For example, if you know that x + y > 5 (note "strictly greater than 5") and you plug in (3,2), you get 5 > 5, which is not true. However if the inequality were x + y >= 5, (3,2) works.