Algebra 1 : How to find the solution to an inequality with subtraction

Study concepts, example questions & explanations for Algebra 1

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Example Questions

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Example Question #24 : Systems Of Inequalities

Solve the inequality:

Possible Answers:

Correct answer:

Explanation:

First combine like terms on the right side of the inequality to obtain . Next, try to isolate the variable:.

The answer is therefore .

Example Question #1 : How To Find The Solution To An Inequality With Subtraction

Solve the inequality:

Possible Answers:

Correct answer:

Explanation:

Distribute the negative sign first:  becomes . Since there are no like-terms to combine on one side of the inequality sign, we will try to isolate the variable: . The answer is therefore

Example Question #26 : Systems Of Inequalities

Which one of the following is is a valid value for ?

Possible Answers:

Correct answer:

Explanation:

Since the inequality includes absolute value, you have two possiblities to consider: when the outcome is positive and when it is negative. When you consider the negative outcome, you must flip the inequality sign to solve for :

This means that  is less than positive 20 AND greater than negative 20:

   AND   

For each case, you will first subtract 4 from the left to the right. Then, you will divide both sides by 4 to isolate :

          AND     

              AND     

This gives you the interval for valid values of :

Example Question #2 : How To Find The Solution To An Inequality With Subtraction

What is a possible valid value of ?

Possible Answers:

Correct answer:

Explanation:

This inequality can be rewritten as:

4x + 14 > 30  OR 4x + 14 < –30

Solve each for x:

4x + 14 > 30; 4x > 16; x > 4

4x + 14 < –30; 4x < –44; x < –11

Therefore, anything between –11 and 4 (inclusive) will not work. Hence, the answer is 7.

Example Question #3 : How To Find The Solution To An Inequality With Subtraction

Solve for .

Possible Answers:

Correct answer:

Explanation:

First subtract 2p from both sides:

p + 5 < 12.

Then subtract 5 from both sides:

p < 7

 

Example Question #4 : How To Find The Solution To An Inequality With Subtraction

Solve the following inequality.

Possible Answers:

Correct answer:

Explanation:

Isolate the term with  on one side and the constants on the other side.

First subtract 7x on both sides and add 5 to both sides.

Next, divide by 3 to solve for x.

Example Question #2163 : Algebra 1

Solve for

Possible Answers:

Correct answer:

Explanation:

To solve for the variable we need to isolate the variable on one side of the inequality and all other constants on the other side. In order to do this, perform inverse operations.

First subtracting 7 from both sides we get:

Then subtracting 2x from both sides:

Finally divide both sides by 2:

 

Example Question #2164 : Algebra 1

Find all of the solutions to this inequality.

Possible Answers:

Correct answer:

Explanation:

To solve an inequality, isolate the variable on one side with all other constants on the other side. To accomplish this, perform opposite operations to manipulate the inequality.

First, isolate the x by adding six to each side.

Whatever you do to one side you must also do to the other side.

This gives you:

The answer, therefore, is .

Example Question #2165 : Algebra 1

Solve the following inequality:  

Possible Answers:

Correct answer:

Explanation:

In order to isolate the  variable, we will need to subtract 10 on both sides of the equation.

Simplify the left and the right side of the equation.

The answer is:  

Example Question #2166 : Algebra 1

Solve for x:

Possible Answers:

Correct answer:

Explanation:

When you are solving for an inequality, it is easiest to treat the inequality sign as an equal sign while you solve for x. 

In order to solve for x, you need to get x by itself on one side. The first thing you would need to do is subtract 6 from both sides. That would leave you with . In order to get x by itself, you need to divide both sides by 9. This would bring you to the answer of .

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