document.write( "Question 937813: ed is twice as old as dave
\n" ); document.write( "fran is 13 years younger than ed
\n" ); document.write( "Fran is 5 years older than dave\r
\n" ); document.write( "\n" ); document.write( "Question : form an equation in x (taking Dave's age to be x) and solve the equation to find Dave's age
\n" ); document.write( "

Algebra.Com's Answer #571238 by ankor@dixie-net.com(22740)\"\" \"About 
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ed is twice as old as dave
\n" ); document.write( "fran is 13 years younger than ed
\n" ); document.write( "Fran is 5 years older than dave
\n" ); document.write( "Question : form an equation in x (taking Dave's age to be x) and solve the equation to find Dave's age
\n" ); document.write( ":
\n" ); document.write( "ed is twice as old as dave
\n" ); document.write( "e = 2x
\n" ); document.write( ":
\n" ); document.write( "fran is 13 years younger than ed
\n" ); document.write( "f = e - 13
\n" ); document.write( "replace e with 2x (from the 1st statement)
\n" ); document.write( "f = 2x - 13
\n" ); document.write( ":
\n" ); document.write( "Fran is 5 years older than dave
\n" ); document.write( "f = x + 5
\n" ); document.write( ":
\n" ); document.write( "f = f, so write the equation as
\n" ); document.write( "2x - 13 = x + 5
\n" ); document.write( "2x - x = 5 + 13
\n" ); document.write( "x = 18 is Dave's age
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Confirm this with the two Fran equations
\n" ); document.write( "f = 2(18) - 13
\n" ); document.write( "f = 23
\n" ); document.write( "and
\n" ); document.write( "f = 18 + 5
\n" ); document.write( "f = 23
\n" ); document.write( "
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