Graphing Linear Inequalities in 2 Variables By Tristen Billerbeck.

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Presentation transcript:

Graphing Linear Inequalities in 2 Variables By Tristen Billerbeck

Linear Inequality Forms

Solutions  An ordered pair (x, y) is a solution of a linear inequality in two variables if the inequality is true when the values of x and y are substituted into the inequality.  Example: Given: 2x + 5y > 12 Is (1, 3) a solution? 2(1) + 5(3) > > > 12 Yes, it is a solution!

Solutions

Solid Line or Dashed Line?

Just Checking

Test Points to Determine Solutions  What is a test point?  It tells us if it’s a solution or not.  If it is a solution then that’s the side of the line that is shaded, which is called a half-plane.  If it is not a solution then that’s the side of the line that is not shaded, which is also called a half-plane.  For all equations, except ones going through the origin, use (0,0) as a test point----because it’s easy to use!

Linear Inequality Graphs

 What do you think y < x – 3 would look like?  Would it have a solid or dotted line?  Would it be shaded above or below the line?

Linear Inequality Graphs

 What do you think y > -2 would look like?  Would it have a solid or dotted line?  Would it be shaded above or below the line?

Real Life