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

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #11 : Inequalities

The inequality is equivalent to which of the following inequalities?

Possible Answers:

Correct answer:

Explanation:

In order to simplify an inequality, we must bring the unknown () values on one side and the integers on the other side of the inequality:

 

 

 

Example Question #161 : Equations / Inequalities

.  Solve for  

Possible Answers:

Correct answer:

Explanation:

We must put all of the like terms together on either side of the inequality symbol. First, we need to subtract the  to the right side and add  to the left side to get all of the terms with  to the right side of the inequality and all of the integers to the left side.

 

We solve for  by dividing by .  

That leaves us with , which is the same as .  Remember, you only flip the direction of the inequality if you divide by a negative number!  

Example Question #17 : Inequalities

Solve the following inequality:

Possible Answers:

Correct answer:

Explanation:

To solve an equality that has addition, simply treat it as an equation. Remember, the only time you have to do something to the inquality is when you are multiplying or dividing by a negative number.

Subrtract 4 from each side. Thus,

Example Question #18 : Inequalities

Solve:

Possible Answers:

Correct answer:

Explanation:

First, we want to group all of our like terms.  I will move all of my integers to the left side of the inequality. 

Since we are not dividing by a negative sign, we do not have to flip the inequality. 

Example Question #15 : How To Find The Solution To An Inequality With Addition

Solve:

Possible Answers:

Correct answer:

Explanation:

The first thing that we have to do is deal with the absolute value.  We simply remove the absolute value by equating the left side with the positive and negative solution (of the right side). When we include the negative solution, we must flip the direction of the inequality. Shown explicitly:

Now, we simply solve the inequality by moving all of the integers to the right side, and we are left with:   This reduces down to 

Example Question #11 : How To Find The Solution To An Inequality With Addition

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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