SOLVING LINEAR EQUATIONS

Recall the following:


Problem 1.4b:

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Answer: tex2html_wrap_inline790

Solution: Multiply both sides by 105, the smallest number that 5, 7, and 21 divides into evenly.

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Simplify:

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Subtract 10x from both sides of the equation:

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Subtract 84 from both sides of the equation:

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Divide both sides by 74:

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The answer is tex2html_wrap_inline790 .




Check the solution by substituting tex2html_wrap_inline790 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.

Since the left side of the original equation equals the right side of the original equation when tex2html_wrap_inline790 substituted for x, then tex2html_wrap_inline808 is the correct answer.




You can also check your answer with the calculator tex2html_wrap_inline810

You can also check your answer by graphing tex2html_wrap_inline816 (left side of the original equation minus the right side of the original equation). The x intercept is 1.5.


If you would like to review the solution to problem 1.4c, 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.

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Author:Nancy Marcus

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