document.write( "Question 1062925: you sell 10 times as many cupcakes as your friend. the difference of your sales is 81. how many cupcakes did you sell? how many did your friends sell? \n" ); document.write( "

Algebra.Com's Answer #677929 by josgarithmetic(39630) $\"\"$ $\"About$

You can put this solution on YOUR website!
x,y for self, friend\r
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\n" ); document.write( "\n" ); document.write( " $\"system%28x=10y%2Cx-y=81%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"%2810y%29-y=81\"$
\n" ); document.write( " $\"9y=81\"$
\n" ); document.write( " $\"y=9\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"system%28x=90%2Cy=9%29\"$ \n" ); document.write( "

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