document.write( "Question 944760: mary is half as old as joseph. the sum of their ages is 51. how old are they now? \n" ); document.write( "
Algebra.Com's Answer #576042 by macston(5194)![]() ![]() You can put this solution on YOUR website! M is Mary's age. J is Joseph's age \n" ); document.write( "J=2M; J+M=51 Substitute first equation for J in second equation \n" ); document.write( "2M+M=51 \n" ); document.write( "3M=51 Divide by 3 \n" ); document.write( "M=17 ANSWER 1: Mary is 17 \n" ); document.write( "J=2M \n" ); document.write( "J=2(17) \n" ); document.write( "J=34 ANSWER 2: Joseph is 34 \n" ); document.write( "CHECK \n" ); document.write( "M+J=51 \n" ); document.write( "17+34=51 \n" ); document.write( "51=51 \n" ); document.write( " |