SOLVING LINEAR EQUATIONS

Recall the following:


Problem 1.4d:

displaymath712

Answer: x=5

Solution: Multiply both sides by 9:

displaymath713

Simplify:

displaymath714

displaymath715

Subtract x from both sides of the equation:

displaymath716

Add 2 to both sides of the equation:

displaymath717

Divide both sides by 3:

displaymath718

The answer is x=5.

Check the solution by substituting 5 in the original equation for x. If the left side of the equation equals the right side of the equation after the substitution, you have found the correct answer.

You can also check your answer with the calculator. Since the left side of the original equation equals the right side of the original equation when 5 substituted for x, then x=5 is the correct answer.

You can also check your answer by graphing tex2html_wrap_inline870 (left side of the original equation minus the right side of the original equation). The x-intercept is 5.


If you would like to review the solution to problem 1.4e, click on solution.

If you would like to go back to the problem page, click on problem.

If you would like to go back to the equation Table of contents, click on Contents.

[Algebra] [Trigonometry]
[Geometry] [Differential Equations]
[Calculus] [Complex Variables] [Matrix Algebra]

S.O.S MATHematics home page

Do you need more help? Please post your question on our S.O.S. Mathematics CyberBoard.

Author:Nancy Marcus

Copyright 1999-2017 MathMedics, LLC. All rights reserved.
Contact us
Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA
users online during the last hour