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Solving Single-Step Inequalities by Addition or Subtraction




 
Related Topics:
More Lessons for Algebra

Math Worksheets

How to solve inequalities?
The rules for solving inequalities are similar to those for solving linear equations. However, there is one exception, when multiplying or dividing by a negative number it is necessary to reverse the inequality sign.

Solving Single-Step Inequalities by Addition

Example :

Solve x – 6 > 14

Solution:

x – 6 > 14

x – 6+ 6 > 14 + 6

x > 20

Example :

Solve the inequality –7 – x < 9

Solution:

–7 – x < 9

7 – x + 7 < 9 + 7

x < 16

x > –16 (multiply both sides by –1 and reverse the sign)



Solving Single-Step Inequalities by Subtraction

Example:

Solve x + 7 < 15

Solution:

x + 7 < 15

x + 7 – 7 < 15 – 7

x < 8

Example :

Solve the inequality 12 > 18 – y

Solution:

12 > 18 – y

18 – y < 12

18 – y – 18 < 12 –18

y < –6

y > 6 (multiply both sides by –1 and reverse the sign)




The following video shows how to solve single-step inequalities by addition or subtraction.

This video explains how to solve one step linear inequalities in one variable with the variable on the left side. The solution is graphed and expressed using interval notation.


 

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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