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Q&A #9409

Teachers' Lounge Discussion: Solving algebraic equations

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From: Frank <frankbirgit@mail.dk>
To: Teacher2Teacher Public Discussion
Date: 2003110710:55:31
Subject: Re: thank you for your question


Just to avoid any misunderstandings.
Jackie wrote:

"8m + 13 = 13 + 8m
8m - 8m = 13 - 13
0 = 0
therefore the answer is 0 = 0"

0=0 is not the answer to the equation. Since you have simplyfied the
equation 8m+13=13 + 8m into 0 =0 which is true no matter the value of
m the solutions to the equation is all numbers. That is any real
number would be a solution.
Ex. Lets try with 100: substituting x with 100 gives:
800+13=13+800 which is true so 100 is a solution!


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