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With the equal sign (=).
Linear programming is just graphing a bunch of linear inequalities. Remember that when you graph inequalities, you need to shade the "good" region - pick a point that is not on the line, put it in the inequality, and the it the point makes the inequality true (like 0
By finding something who's behavior is represented by a linear function and graphing it.
When the line goes through the origin like y>3x. Notice that there is no constant added to the end.
If the equal sign in a linear equation in two variables is replaced with an inequality symbol, the result is a linear inequality in two variables. 3x-2y>7 x<-5