document.write( "Question 966697: the sum of two number is 45. three times the first number plus seven times the seconds 115. find the two number \n" ); document.write( "
Algebra.Com's Answer #590881 by checkley77(12844)\"\" \"About 
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X+Y=45 MULTIPLY BY -3 & ADD.
\n" ); document.write( "3X+7Y=115
\n" ); document.write( "-3X-3Y=-135
\n" ); document.write( "-------------
\n" ); document.write( "4Y=-20
\n" ); document.write( "Y=-20/4
\n" ); document.write( "Y=-5 ANS
\n" ); document.write( "X-5=45
\n" ); document.write( "X=45+5
\n" ); document.write( "X=50 ANS.
\n" ); document.write( "PROOF:
\n" ); document.write( "3*50+7*-5=115
\n" ); document.write( "150-35=115
\n" ); document.write( "115=115
\n" ); document.write( "
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