document.write( "Question 101900This question is from textbook PRENTICE HALL MATHEMATICS ALGEBRA 1
\n" ); document.write( ": PLEASE HELP ME FIND THE ANSWER TO: 7X+15Y=39 X-3Y=-20
\n" ); document.write( " THE CHAPTER IS CALLED SOLVING SYSTEMS USING ELIMINATION \n" ); document.write( "
Algebra.Com's Answer #74113 by checkley75(3666)\"\" \"About 
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7X+15Y=39
\n" ); document.write( "X-3Y=-20 NOW MULTIPLY THIS EQUATION BY 5 AND ADD THE 2 EQUATIONS
\n" ); document.write( "5X-15Y=-100
\n" ); document.write( "7X+15Y=39
\n" ); document.write( "------------------------------
\n" ); document.write( "12X=-61
\n" ); document.write( "X=-61/12 ANSWER.
\n" ); document.write( "-61/12-3Y=-20
\n" ); document.write( "-3Y=-20+61/12
\n" ); document.write( "-3Y=(-240+61)/12
\n" ); document.write( "-3Y=-179/12
\n" ); document.write( "-Y=(-179/12)/-3
\n" ); document.write( "Y=(-179/12)(-1/3)
\n" ); document.write( "Y=179/36 ANSWER.
\n" ); document.write( "PROOF
\n" ); document.write( "7(-61/12)+15(179/36)=39
\n" ); document.write( "-427/12+2685/36=39
\n" ); document.write( "(3*-427+2685)/36=39
\n" ); document.write( "(-1281+2685)/36=39
\n" ); document.write( "1404/36=39
\n" ); document.write( "39=39\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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