Again, make sure each term is multiplied by Graph the boundary line.

We may merely write m - 6. Since the graph of a first-degree equation in two variables is a straight line, it is only necessary to have two points.

These are numbered in a counterclockwise direction starting at the upper right. Later studies in mathematics will include the topic of linear programming. Compare your solution with the one obtained in the example.

Check these values also. Example 1 Solve by the substitution method: Study the diagram carefully as you note each of the following facts. In order to graph a linear inequality, we can follow the following steps: Remember that the solution for a system must be true for each equation in the system.

Step 3 If the point chosen is in the solution set, then that entire half-plane is the solution set. How many ordered pairs satisfy this equation? We could also say that the change in x is 4 and the change in y is - 1.

In the same manner the solution to a system of linear inequalities is the intersection of the half-planes and perhaps lines that are solutions to each individual linear inequality.

The change in x is -4 and the change in y is 1. Step 3 Starting at 0,buse the slope m to locate a second point. We could choose any values at all.

Suppose we chose These facts give us the following table of values: The point - 2,3 is such a point. The boundary line is precisely the linear equation associated with the inequality, drawn as either a dotted or a solid line.

Notice that once we have chosen a value for x, the value for y is determined by using the equation. This is one of the points on the line. We can choose either x or y in either the first or second equation. We can use the method described above to find each linear inequality associated with the boundary lines for this region.

Can we still find the slope and y-intercept? Equations in two unknowns that are of higher degree give graphs that are curves of different kinds. Compare these tables and graphs as in example 3. We will accomplish this by choosing a number for x and then finding a corresponding value for y.

The change in x is -4 and the change in y is 1.Applications of Systems. Learning Objectives. Solve mixture problems Write a system of linear equations representing a mixture problem, solve the system and interpret the results; The shaded region to the left represents quantities for which the company suffers a loss.

Example. Next, pick a point not on the line. Check to see if this point satisfies the inequality. If it satisfies the inequality, shade the region which contains that point.

If it does not satisfy the inequality, shade the region which does not contain that point. All the points in the shaded region will satisfy the inequality.

Write a System of Linear Inequalities Write a system of linear inequalities that defines the shaded region shown. Solution Since the shaded region is bounded by two lines, you know that the system must have two linear inequalities.

INEQUALITY 1 The first inequality is bounded by the line that passes through the points (0, 1) and (3, 4). The slope of this line can be found using the formula for slope. m Write formula. 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 \(y = mx + b\). Write a System of Linear Inequalities Write a system of linear inequalities that defines the shaded region shown.

Solution Since the shaded region is bounded by two lines, you know that the system must have two linear inequalities. INEQUALITY 1 The first inequality is bounded by the line that passes through the points (0, 1) and (3, 4).

The slope of this line can be found using the formula for slope. m Write. 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.

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