document.write( "Question 753887: Jeff is 7 years older than Marty. The sum of their ages is 71. How old is Marty \n" ); document.write( "
Algebra.Com's Answer #458693 by ankor@dixie-net.com(22740)\"\" \"About 
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Write an equation for each statement
\n" ); document.write( ":
\n" ); document.write( "Jeff is 7 years older than Marty.
\n" ); document.write( "j = m + 7
\n" ); document.write( "or
\n" ); document.write( "j - m = 7
\n" ); document.write( ":
\n" ); document.write( "The sum of their ages is 71.
\n" ); document.write( "j + m = 71
\n" ); document.write( ":
\n" ); document.write( "Use elimination here, add the two equations
\n" ); document.write( "j - m = 7
\n" ); document.write( "j + m = 71
\n" ); document.write( "------------adding eliminates m, find j
\n" ); document.write( "2j = 78
\n" ); document.write( "j = 78/2
\n" ); document.write( "j = 39 is Jeff's age
\n" ); document.write( ":
\n" ); document.write( " How old is Marty? I'll let you find this
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