document.write( "Question 140902This question is from textbook
\n" ); document.write( ": 0.05x + 0.25y=66
\n" ); document.write( "0.15x + 0.05y=72\r
\n" ); document.write( "\n" ); document.write( "Solving by elimination. \n" ); document.write( "
Algebra.Com's Answer #102590 by checkley77(12844)\"\" \"About 
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0.05x + 0.25y=66 multiply this equation by -3 & add.
\n" ); document.write( "0.15x + 0.05y=72
\n" ); document.write( "-.15x-.75y=-198
\n" ); document.write( "--------------------------
\n" ); document.write( "-.7y=-126
\n" ); document.write( "y=-126/-.7
\n" ); document.write( "y=180 answer.
\n" ); document.write( ".05x+.25*180=66
\n" ); document.write( ".05x+45=66
\n" ); document.write( ".05x=66-45
\n" ); document.write( ".05x=21
\n" ); document.write( "x=21/.05
\n" ); document.write( "x=420 answer.
\n" ); document.write( "proof:
\n" ); document.write( ".15*420+.05*180=72
\n" ); document.write( "63+9=72
\n" ); document.write( "72=72\r
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