document.write( "Question 358073: Twice the small number is 5 more than 2/3 the larger number. Three times the larger number is 4 less than 15 times the smaller number. Find the value of both numbers. \n" ); document.write( "
Algebra.Com's Answer #255658 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! Let x = the large number \n" ); document.write( "Let y = the small number \n" ); document.write( ": \n" ); document.write( "Write an equation for each statement: \n" ); document.write( ": \n" ); document.write( "Twice the small number is 5 more than 2/3 the larger number. \n" ); document.write( "2y = \n" ); document.write( "Get rid of that annoying fraction, multiply by 3, results: \n" ); document.write( "6y = 2x + 15 \n" ); document.write( "-2x + 6y = 15 \n" ); document.write( ": \n" ); document.write( " Three times the larger number is 4 less than 15 times the smaller number. \n" ); document.write( "3x = 15y - 4 \n" ); document.write( "3x - 15y = -4 \n" ); document.write( ": \n" ); document.write( "Use elimination here, multiply the 1st equation by 3, and the 2nd equation by 2 \n" ); document.write( "-6x + 18y = 45 \n" ); document.write( "+6x - 20y = -8 \n" ); document.write( "-------------------adding eliminates x, find y \n" ); document.write( "-12y = 37 \n" ); document.write( "y = \n" ); document.write( ": \n" ); document.write( "Use the 1st equation to find x \n" ); document.write( "-2x + 6( \n" ); document.write( "-2x + \n" ); document.write( "Multiply by 2 \n" ); document.write( "-4x - 37 = 30 \n" ); document.write( "-4x = 30 + 37 \n" ); document.write( "-4x = 67 \n" ); document.write( "x = \n" ); document.write( ": \n" ); document.write( "A couple nasty fractions, see if they work in the 2nd equation \n" ); document.write( "3x - 15y = -4 \n" ); document.write( "Substitute \n" ); document.write( "3( \n" ); document.write( " \n" ); document.write( "multiply by 12 to get rid of those annoying fractions \n" ); document.write( "3(201) + 555 = -48 \n" ); document.write( "-603 + 555 = -48; it does work, amazing isn't it! \n" ); document.write( " \n" ); document.write( " |