document.write( "Question 247145: what multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x-y=7 ,2x+7y=42 \n" ); document.write( "
Algebra.Com's Answer #180334 by checkley77(12844)\"\" \"About 
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3x-y=7 multiply this equation by 7 & add.
\n" ); document.write( "2x+7y=42
\n" ); document.write( "21x-7y=49
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\n" ); document.write( "23x=91
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