document.write( "Question 182071: What if the equations are 7r-6s=42 and 6r+7s=75 ? Would you multiply both equations by -6?I have done it like that I get an answer that I do not think is right.
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Algebra.Com's Answer #136664 by checkley77(12844) $\"\"$ $\"About$

You can put this solution on YOUR website!
7r-6s=42 if you're going to use the elimination method then you need to multipy either the s term in the first equation by 7 & then s term in the second equation by 6 & then add them.
\n" ); document.write( "6r+7s=75
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\n" ); document.write( "49r-42s=294
\n" ); document.write( "36r-42s=450
\n" ); document.write( "-----------------
\n" ); document.write( "85r=744
\n" ); document.write( "r=744/85 or 8.75294 ans.
\n" ); document.write( "7*8.75294-6s=42
\n" ); document.write( "61.2706-6s=42
\n" ); document.write( "-6x=42-61.2706
\n" ); document.write( "-6x=-19.27056
\n" ); document.write( "x=-19.27056/-6
\n" ); document.write( "x=3.2118 ans
\n" ); document.write( "Proof:
\n" ); document.write( "6*8.75294+7*3.2118=75
\n" ); document.write( "52.51764+22.4826=75
\n" ); document.write( "75~75 \n" ); document.write( "

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