Thus we multiply each term of this equation by - 1. Step 4 Find the value of the other unknown by substituting this value into one of the original equations. Why do we need to check only one point?

Solve this system by the addition method. Solution Step 1 We must solve for one unknown in one equation. In this case, solving by substitution is not the best method, but we will do it that way just to show it can be done.

If the point chosen is not in the solution set, then the other half-plane is the solution set. Graph a straight line using its slope and y-intercept. In this example, we can use the origin 0, 0 as a test point.

The arrows indicate the number lines extend indefinitely. Inconsistent equations The two lines are parallel. In this case there is a unique solution. Notice that all of these linear inequalities have linear equations, which can be associated with them if we replace the inequality with an equality.

Solution We wish to find several pairs of numbers that will make this equation true. Independent equations have unique solutions. The answer to this question is yes.

Equations in the preceding sections have all had no fractions, both unknowns on the left of the equation, and unknowns in the same order. The check is left up to you.

Always start from the y-intercept. Given an ordered pair, locate that point on the Cartesian coordinate system. You may want to review that section. We then find x by using the equation. This is done by first multiplying each side of the first equation by Of course, we could also start by choosing values for y and then find the corresponding values for x.

The slope from one point on a line to another is the ratio. The plane is divided into four parts called quadrants. Use the test point to determine which half-plane should be shaded.

If the inequality is of the form then the region below the line is shaded and the boundary line is solid. Since we are dealing with equations that graph as straight lines, we can examine these possibilities by observing graphs.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. spend on fuel. Write and graph a system of linear inequalities to represent this situation.

2. A salad contains ham and chicken. There are at most 6 pounds of ham and chicken in the salad.

Write and graph a system of inequalities to represent this situation. 3. Create and write your own word problem. Solve it as well. 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. Fuel x costs $2 per gallon and fuel y costs $3 per gallon. You have at most $18 to spend on fuel.

Write and graph a system of linear inequalities to represent this situation. Mike shoots a large marble (Marble A, mass: kg) at a smaller marble (Marble B, mass: kg) that is sitting still. Marble A was initially moving at /5(6).

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.

DownloadWrite a system of linear inequalities to represent each graph

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