# Write and solve a system of two inequalities by graphing

We first need to review the symbols for inequalities: There are endless solutions for inequalities. In light of this fact, it may be easiest to find a solution set for inequalities by solving the system graphically. A system of inequalities is two or more inequalities that pertain to the same problem. In order to solve the system, we will need to graph two inequalities on the same graph and then be able to identify the areas of intersection on the graph. Take a look at a graph for a system of inequalities and then we will walk through a few examples step-by-step.

Notice how we still use solid and dotted boundary lines based on the inequality symbol. You will also use a test point and shade the half plane that contains all solutions, just as we discussed in the graphing inequalities lesson. The only difference for this lesson will be that we must graph two inequalities on the same graph and then identify the area shaded by BOTH inequalities.

Let's take a look at our first example and this will make more sense. Systems of Inequalities Not too bad, is it?

It might help for you to have two different colored pencils if you are practicing along with me. If you don't have colored pencils, then you can draw horizontal lines for one inequality and vertical lines for the other. This will make it easier to see which area contains solutions for both inequalities.

Steps for Graphing Systems of Inequalities Graph the boundary line for the first inequality. Use a test point to determine which half plane to shade. Shade the half plane that contains the solutions to the first inequality.

Graph the boundary line for the second inequality. Shade the half plane that contains the solutions to the second inequality. Analyze your system of inequalities and determine which area is shaded by BOTH inequalities.

This area is the solution for the system of inequalities. The next example will demonstrate how to graph a horizontal and a vertical line.

Systems of Inequalities Example number two may have looked confusing at first because of the inequalities. Horizontal and vertical lines only have 1 variable. Use the Mathway calculator to check your answers!Systems of linear inequalities A system of linear inequalities in two variables consists of at least two linear inequalities in the same variables.

The solution of a linear inequality is the ordered pair that is a solution to all inequalities in the system and the graph of the linear inequality is the graph of all solutions of the system. How To Solve Systems of Inequalities Graphically. 1) Write the inequality in slope-intercept form or in the form $$y = mx + b$$. For example, if asked to solve $$x + y \leq 10$$, we first re-write as $$y \leq -x + 10$$. 2) Temporarily exchange the given inequality symbol (in this case $$\leq$$) for just equal symbol.

In doing so, you can treat the inequality like an equation. A system of inequalities is two or more inequalities that pertain to the same problem. In order to solve the system, we will need to graph two inequalities on the same graph and then be able to identify the areas of intersection on the graph.

Concept Writing & Graphing Inequalities Pre Score 5 = Level 4 DEADLINE: (C) Level 2 1. Watch the video (Level 2: Write Linear Equations) Complete the Notes & Basic Practice Check the Key and Correct Mistakes 2.

Complete 2 of the following tasks Graph a linear inequality in two . In light of this fact, it may be easiest to find a solution set for inequalities by solving the system graphically. How To Solve Systems of Inequalities Graphically 1) Write the inequality in slope-intercept form or in the form $$y = mx + b$$.

Writing, Solving, and Graphing Inequalities in One Variable. we also have to add it to the right side in order to keep the inequality true. We can write this property as: we can solve two-step inequalities by manipulating the inequality so that we isolate the variable.

Observe how to solve a two-step problem. Solving Systems of Inequalities - Free Math Help