Algebra 1 : Graphing Inequalities

Study concepts, example questions & explanations for Algebra 1

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Example Questions

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Example Question #11 : Graphing Inequalities

Screen shot 2015 08 05 at 11.59.11 am

The above graph depicts which of the following equations or inequalities?

Possible Answers:

Correct answer:

Explanation:

Given the above graph, we can initially deduce that , and  are not the correct answer. The dashed line in the graph indicates that no point on the line  is a solution to the inequality, and the shaded area indicates that the correct answer must account for points in a certain region beyond . Thus, we're left with  and .

 

We can use a test point to determine which of the remaining inequalities is the correct answer. The test point can be any point that is not on the line, so let's select  in this case. Plugging  into  yields . Since this is true, we know that every point on the same side of the line as  will yield a true result, and that our graph represents .

Example Question #72 : Linear Inequalities

Screen shot 2015 08 06 at 5.10.17 pm

The above graph depicts which of the following equations or inequalities?

Possible Answers:

Correct answer:

Explanation:

Given the above graph, we can initially deduce that , , and  are not the correct answer. The dashed line in the graph indicates that no point on the line  is a solution to the inequality, and the shaded area indicates that the correct answer must account for points in a certain region beyond . Thus, we're left with  and .

We can use a test point to determine which of the remaining inequalities is the correct answer. The test point can be any point that is not on the line, so let's select  in this case. Plugging  into  yields . Since this is true, we know that every point on the same side of the line as  will yield a true result, and that our graph represents .

Example Question #71 : Linear Inequalities

Screen shot 2015 08 06 at 5.17.13 pm

The above graph depicts which of the following equations or inequalities?

Possible Answers:

Correct answer:

Explanation:

Given the above graph, we can initially deduce that , and  are not the correct answer. The solid line in the graph indicates that all points on the line   are solutions to the inequality, and the shaded area indicates that the correct answer must account for points in a certain region beyond . Thus, we're left with  and .

We can use a test point to determine which of the remaining inequalities is the correct answer. The test point can be any point that is not on the line, so let's select  in this case. Plugging  into  yields . Since this is true, we know that every point on the same side of the line as  will yield a true result, and that our graph represents .

Example Question #11 : Graphing Inequalities

Screen shot 2015 08 06 at 5.30.10 pm

The above graph depicts which of the following equations or inequalities?

Possible Answers:

Correct answer:

Explanation:

Given the above graph, we can initially deduce that , and  are not the correct answer. The solid line in the graph indicates that all points on the line   are solutions to the inequality, and the shaded area indicates that the correct answer must account for points in a certain region beyond . Thus, we're left with  and .

We can use a test point to determine which of the remaining inequalities is the correct answer. The test point can be any point that is not on the line, so let's select  in this case. Plugging  into  yields . Since this is true, we know that every point on the same side of the line as  will yield a true result, and that our graph represents .

Example Question #12 : Graphing Inequalities

What is the equation of the graph of the inequality shown below?

Inequality question

Possible Answers:

Correct answer:

Explanation:

Because the line is a solid line and is shaded down you know that the equation is less than or equal to some function.

When finding slope, you must find the rise over the run which is 2. The function also has a y-intercept of 7,

So your end result of your equation is:

Example Question #76 : Linear Inequalities

Which of the following graphs correctly depicts the graph of the inequality  

Possible Answers:

Question_8_correct

Question_8_incorrect_1

Question_8_incorrect_3

Question_8_incorrect_2

None of the graphs.

Correct answer:

Question_8_correct

Explanation:

Let's start by looking at the given equation:

The inequality is written in slope-intercept form; therefore, the slope is equal to  and the y-intercept is equal to .

All of the graphs depict a line with slope of  and y-intercept . Next, we need to decide if we should shade above or below the line. To do this, we can determine if the statement is true using the origin . If the origin satisfies the inequality, we will know to shade below the line. Substitute the values into the given equation and solve.

Because this statement is true, the origin must be included in the shaded region, so we shade below the line.

Finally, a statement that is "less than" or "greater than" requires a dashed line in the graph. On the other hand, those that are "greater than or equal to" or "less than or equal to" require a solid line. We will select the graph with shading below a dashed line.

Question_8_correct

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