ACT Math : How to graph a two-step inequality

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : How To Graph A Two Step Inequality

Solve and graph the following inequality:

Possible Answers:

Correct answer:

Explanation:

To solve the inequality, the first step is to add  to both sides:

 

The second step is to divide both sides by :

To graph the inequality, you draw a straight number line. Fill in the numbers from  to infinity. Infinity can be designated by a ray. Be sure to fill in the number , since the equation indicated greater than OR equal to.

The graph should look like:

Number_line

Example Question #2 : How To Graph A Two Step Inequality

Points  and  lie on a circle. Which of the following could be the equation of that circle?

Possible Answers:

Correct answer:

Explanation:

If we plug the points  and  into each equation, we find that these points work only in the equation . This circle has a radius of  and is centered at .

Example Question #3 : How To Graph A Two Step Inequality

Which of the following lines is perpendicular to the line ?

Possible Answers:

Correct answer:

Explanation:

The key here is to look for the line whose slope is the negative reciprocal of the original slope.

In this case,  is the negative reciprocal of .

Therefore, the equation of the line which is perpendicular to the original equation is:

Example Question #131 : Psat Mathematics

Let D be the region on the (x,y) coordinate plane that contains the solutions to the following inequalities:

, where  is a positive constant

Which of the following expressions, in terms of , is equivalent to the area of D?

Possible Answers:

Correct answer:

Explanation:

  Inequality_region1

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