document.write( "Question 170650: Claire, who is six years older than her sister Amy, is now three times as old as Amy was four years ago.
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Algebra.Com's Answer #125983 by Mathtut(3670)\"\" \"About 
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lets call claire and Amy's age, c and a , respectively.
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\n" ); document.write( "c=a+6......eq 1
\n" ); document.write( "c=3(a-4)...eq 2
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\n" ); document.write( "take c's value from eq 1 and plug it into eq 2
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\n" ); document.write( "(a+6)=3(a-4)
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\n" ); document.write( "a+6=3a-12
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\n" ); document.write( "2a=18
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\n" ); document.write( "\"highlight%28a=9%29\"amy's age
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\n" ); document.write( "\"highlight%28c=9%2B6=15%29\"claire's age
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