document.write( "Question 1198772: Freddy is 3 years older than 6 times his grandson's age. The sum of their ages is greater than 67. What is the youngest age Freddy's grandson can be? \n" ); document.write( "
Algebra.Com's Answer #832418 by Theo(13342)![]() ![]() You can put this solution on YOUR website! let x = freddy's age. \n" ); document.write( "let y = his grandson's age.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "you have an equation and an inequality.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the equation is x = 6y + 3\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the inequality is x + y > 67\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "replace x with 6y + 3 in the inequality to get: \n" ); document.write( "6y + 3 + y > 67 \n" ); document.write( "combine like terms to get: \n" ); document.write( "7y + 3 > 67 \n" ); document.write( "subtract 3 from both sides of the inequality to get: \n" ); document.write( "7y > 64 \n" ); document.write( "solve for y to get: \n" ); document.write( "y > 64/7\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that should be your solution. \n" ); document.write( "you have to solve the equation and the inequality simultaneously. \n" ); document.write( "the common solution is when y > 64/7.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "when y > 64/7, x = 6y + 3 will be greater than 405/7 and x + y will be greater than 67.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the solution appears to be that y > 64/7.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the youngest freddy's grandson can be is some amount of age greater than 64/7 years. \n" ); document.write( "it can not be 64/7 because then x = 6y + 3 would become x = 405/7 and 405/7 + 64/7 would be equal to 67 which is not allowed because x + y must be greater than 67.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "y > 64/7 appears to be your solution. \n" ); document.write( "that means that the grandson's age has to be greater than 64/7\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "it can also be shown as y > 9 + 1/7 \n" ); document.write( "it can also be shown as y > 9.142857143, depending on how many digits your calculator can display.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "that's what i get.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |