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)![]() ![]() ![]() You can put this solution on YOUR website! 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( " |