ACT Math : How to find the solution to an inequality with division

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #6 : Inequalities

What is a solution set of the inequality ?

Possible Answers:

Correct answer:

Explanation:

In order to find the solution set, we solve  as we would an equation:

Therefore, the solution set is any value of .

Example Question #183 : Equations / Inequalities

Simplify the following inequality

.

 

Possible Answers:

Correct answer:

Explanation:

For the most part, you can treat inequalities just like equations. (It is not exact, as you will see below.) Thus, start by isolating your variables.  Subtract  from both sides:

Next, subtract  from both sides:

Finally—here you need to be careful—divide by . When you divide or multiply by a negative value in inequalities, you need to flip the inequality sign. 

Thus, you get:

Example Question #184 : Equations / Inequalities

What is the solution to the given inequality:

Possible Answers:

Correct answer:

Explanation:

When solving an inequality in which you have to mulitiply or divide by a negative number, you must "flip" the direction of the inequality. Other than that, solve it nomrally.

Thus the first and only step we have is to divide by  and since that number is negative, we "flip" the inequality.

Yielding:

Example Question #185 : Equations / Inequalities

Solve the following inequality:

Possible Answers:

Correct answer:

Explanation:

To solve, simply solve as though it is an equation.

The goal is to isolate the variable on one side with all other constants on the other side. Perform the opposite operation to manipulate the inequality.

Only when dividing or multiplying by a negative number, will you have to flip the inequality sign.

Example Question #181 : Equations / Inequalities

Solve the following inequality:

Possible Answers:

Correct answer:

Explanation:

To solve, simply treat it as an equation.

This means you want to isolate the variable on one side and move all other constants to the other side through opposite operation manipulation.

Remember, you only flip the inequality sign if you multiply or divide by a negative number.

Thus,

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