Use the y-intercept and the slope to draw the graph, as shown in example 8. Intuitively we can think of slope as the steepness of the line in relationship to the horizontal. Choose one point from each region that will be easy to substitute into the inequality. There are, in fact, three possibilities and you should be aware of them.

Study the diagram carefully as you note each of the following facts. There are algebraic methods of solving systems.

Such first-degree equations are called linear equations. Of course, we could also start by choosing values for y and then find the corresponding values for x. You found in the previous section that the solution to a system of linear equations is the intersection of the solutions to each of the equations.

What are the coordinates of the origin? This means we must first multiply each side of one or both of the equations by a number or numbers that will lead to the elimination of one of the unknowns when the equations are added. In this case there is no solution.

The value of m is 6, therefore the slope is 6. Here we selected values for x to be 2, 4, and 6. Consider how to write a compound inequality to represent the possible ages of a sibling who is not a teenager, and then how to graph the solution set.

Write a compound inequality to represent each sentence. Solution Step 1 We must solve for one unknown in one equation. In this table we let x take on the values 0, 1, and 2. The graph of the intersection is shown in the sixth number line in the boxed figure. The ordered pair 5,7 is not the same as the ordered pair 7,5.

Dependent equations have infinitely many solutions. You will be surprised how often you will find an error by locating all three points. The plane is divided into four parts called quadrants. Compare these tables and graphs as in example 3. Section dealt with solving literal equations.

The graphs of all first-degree equations in two variables will be straight lines. To solve a system of two linear inequalities by graphing, determine the region of the plane that satisfies both inequality statements.

Since two points determine a straight line, we then draw the graph. To graph a linear inequality 1. You may want to review that section. Solve the problem using an inequality.

We can do this since the choices for x were arbitrary. In later algebra courses, methods of recognizing inconsistent and dependent equations will be learned. Write a linear equation in standard form. Graph a straight line using its slope and y-intercept. Such equations are said to be in standard form.

We now wish to find solutions to the system. Compare the coefficients of x in these two equations. Some common phrases that indicate inequality within word problems are "minimum," "maximum," "at most," "at least," and superlatives like "oldest" and "smallest.

Hence, the solution is the other half-plane. Many students forget to multiply the right side of the equation by Now we simply graph and write the answer in interval notation.

-1 0 1 (So the solution is ()1,∞. b. Again, we solve as we did with equations and “flip” the inequality symbol if needed. We get 2 5 10 5 4 6 7 4 2 6 ≤− ≤− + ≤− + ≤ − x x x x x Subtract 2x on both sides Subtract 4 on both sides Divide by 5 on both sides So we graph and write as an interval.

How Do You Write an Inequality from a Number Line Graph? Write an inequality for the graph below. Note: Writing inequalities from a graph on a number line isn't so bad if you know what to do. Watch this tutorial to learn how! Keywords: problem; inequality.

Every value darkened on your graph is a solution to the inequality. Examples: 1) Determine whether each number is a solution of the given inequality. 2x + 4 –4. 4. k ≤ 10 5. m. Write an inequality and solve the problem algebraically. (1) The product of nine and x is greater than six more than the product of three and x.

(2) Joan needed $ to buy a graphing calculator for her math class. If one point of a half-plane is in the solution set of a linear inequality, then all points in that half-plane are in the solution set. This gives us a convenient method for graphing linear inequalities. To graph a linear inequality 1.

Replace the inequality symbol with an equal sign and graph the resulting line. 2. Examples 1–3 Write an inequality for each sentence. 1. The movie will be no more than 90 minutes in length. 2. The mountain is at least feet tall. Examples 4 and 5 Graph each inequality on a number line.

3.a ≤ 6 4. b > 4 5. c ≥ 7 6. d.

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