When graphing a linear inequality in two variables, shade the half plane which contans the test point and donot shade the other half plane.

Test point can be any point which is not on the boundary line.

But using (0,0) is convinient because it is easy to evaluate expressions when 0 is substituted for each variable.

When graphing a linear inequality in two variables, shade the half plane which contans the test point (0,0) and donot shade the other half plane.