Equations in two unknowns that are of higher degree give graphs that are curves of different kinds. The slope from one point on a line to another is determined by the ratio of the change in y to the change in x.

In other words, we will sketch a picture of an equation in two variables. Ordered pairs are always written with x first and then y, x,y.

Which line is steeper? Second we know that if we add the same or equal quantities to both sides of an equation, the results are still equal. In this example, we can use the origin 0, 0 as a test point. Write the equation of a line in slope-intercept form. Replace the inequality symbol with an equal sign and graph the resulting line.

The first number of the ordered pair always refers to the horizontal direction and the second number always refers to the vertical direction.

Draw a straight line through those points that represent the graph of this equation. A common error that many students make is to confuse the y-intercept with the x-intercept the point where the line crosses the x-axis.

Use the y-intercept and the slope to draw the graph, as shown in example 8.

In section we solved a system of two equations with two unknowns by graphing. To solve a system of two linear equations by graphing 1.

Not all pairs of equations will give a unique solution, as in this example. To graph the solution to this system we graph each linear inequality on the same set of coordinate axes and indicate the intersection of the two solution sets.

To solve a system of two linear equations by graphing 1.

Graphically, it means we need to do what we just did -- plot the line represented by each inequality -- and then find the region of the graph that is true for BOTH inequalities.

Look at both equations and see if either of them has a variable with a coefficient of one. Write a linear equation in standard form. If we add the equations as they are, we will not eliminate an unknown. The arrows indicate the number lines extend indefinitely. Remember, x is written first in the ordered pair.

Notice that all of these linear inequalities have linear equations, which can be associated with them if we replace the inequality with an equality.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.

Recall that a system of linear inequalities is a set of linear inequalities in the same variables. Consider the shaded triangle in Figure 2. We can use the method described above to find each linear inequality associated with the boundary lines for this region. The solution region for the previous example is called a "closed" or "bounded" solution, because there are lines on all sides.

That is, the solution region is a bounded geometric figure (a triangle, in that case). 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. A system of two linear inequalities consists of linear inequalities for which we wish to find a simultaneous solution.

The standard form of a linear equation is ax + by = c, where a, b, and c are real numbers. Procedures. To sketch the graph of a linear equation find ordered pairs of numbers that are solutions to the equation.

Systems of Linear Inequalities (page 2 of 2) The solution region for the previous example is called a "closed" or "bounded" solution, because there are lines on all sides. That is, the solution region is a bounded geometric figure (a triangle, in that case).

Solve the following system: 2x – y > –3 4x + y.

DownloadHow to write a system of linear inequalities for a shaded region

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