document.write( "Question 562644: |5x-1|+7=3x \n" ); document.write( "
Algebra.Com's Answer #364644 by issacodegard(60) You can put this solution on YOUR website! I'll prove that there is no solution. \n" ); document.write( "Suppose that there is a solution x. \n" ); document.write( "Then suppose 5x-1>=0. Then x>=1/5. And we have, \n" ); document.write( "|5x-1|+7=3x \n" ); document.write( "5x-1+7=3x \n" ); document.write( "2x=-6 \n" ); document.write( "x=-3 \n" ); document.write( "But, this is not possible since x>=1/5. \n" ); document.write( "So, suppose 5x-1<=0. Then x<=1/5. We have, \n" ); document.write( "|5x-1|+7=3x \n" ); document.write( "-(5x-1)+7=3x \n" ); document.write( "-5x+1+7=3x \n" ); document.write( "8x=8 \n" ); document.write( "x=1 \n" ); document.write( "But, this is not possible since x<=1/5. \n" ); document.write( "So, by contradiction, there is no solution. \n" ); document.write( "Looking at the graphs of the left hand and right hand sides of the equation will show that they don't intersect. \n" ); document.write( " |