document.write( "Question 103304: If we spend $15 for lunch and my friend spent $3 more than I did, what did I spend? \n" ); document.write( "
Algebra.Com's Answer #75125 by JP(22) You can put this solution on YOUR website! Your total spent is $15 \n" ); document.write( "Your friend spent $3 more than you, this is represented by 3+x. \n" ); document.write( "You spent an unknown amount of money, this is represented by x. \n" ); document.write( "So, your equation is 15=3+x+x. \n" ); document.write( "This becomes 15=3+2x. \n" ); document.write( "You then subtract 3 to the other side to get. \n" ); document.write( "12=2x \n" ); document.write( "Then divide 12 by 2, in order to isolate variable \"x\". \n" ); document.write( "6=x is the amount you spent on lunch. \n" ); document.write( "Your friend spent $3 more so add $3 to the amount you spent to get... \n" ); document.write( "$9 spent by your friend.\r \n" ); document.write( "\n" ); document.write( "You=$6 \n" ); document.write( "Friend=$9 \n" ); document.write( "Total=$15 \n" ); document.write( "To prove the solution is valid, plug 6 in for x.\r \n" ); document.write( "\n" ); document.write( "15=3+2(6) \n" ); document.write( "15=3+12 \n" ); document.write( "15=15 thus proving the solution is valid. \n" ); document.write( " |