document.write( "Question 855356: Greg is twice as old as Judy. Three years ago, Greg was 3 times as old as Judy was then. Find their current ages. \n" ); document.write( "
Algebra.Com's Answer #515296 by JulietG(1812)![]() ![]() You can put this solution on YOUR website! G = 2J [Greg is twice as old as Judy.] \n" ); document.write( "G - 3 = 3(J -3) [Three years ago, Greg was 3 times as old as Judy was then. ] \n" ); document.write( ". \n" ); document.write( "Substitute the value of G in the first equation into the second equation. \n" ); document.write( "(2J) - 3 = 3(J-3) \n" ); document.write( "Distribute \n" ); document.write( "2J - 3 = 3J - 9 \n" ); document.write( "Subtract 2J from each side \n" ); document.write( "-3 = J - 9 \n" ); document.write( "Add 9 to each side \n" ); document.write( "6 = J \n" ); document.write( ". \n" ); document.write( "If Judy is 6, and Greg is twice her age, then Greg is 12. \n" ); document.write( "Let's plug it into the second equation to make sure it's correct. \n" ); document.write( "G - 3 = 3(J -3) \n" ); document.write( "12 - 3 = 3(6-3) \n" ); document.write( "9 = 3(3) \n" ); document.write( "9 = 9 \n" ); document.write( "Success! \n" ); document.write( " |