document.write( "Question 157768: Isaac is nine years older than Kylie. Isaac is four times as old as Brian was three years ago. Brian is eighteen years younger than Isaac. How old is Kylie? \n" ); document.write( "
Algebra.Com's Answer #116238 by nerdybill(7384)\"\" \"About 
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Isaac is nine years older than Kylie. Isaac is four times as old as Brian was three years ago. Brian is eighteen years younger than Isaac. How old is Kylie?
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\n" ); document.write( "Let k = Kylie's age
\n" ); document.write( "from:\"Isaac is nine years older than Kylie.\" we get
\n" ); document.write( "k+9 = Issac's age
\n" ); document.write( "from:\"Brian is eighteen years younger than Isaac.\"
\n" ); document.write( "k-18 = Brian's age
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\n" ); document.write( "Our equation is derived from:
\n" ); document.write( "\"Isaac is four times as old as Brian was three years ago.\"
\n" ); document.write( "(k+9) = 4[(k-18)-3]
\n" ); document.write( "k+9 = 4[k-18-3]
\n" ); document.write( "k+9 = 4[k-21]
\n" ); document.write( "k+9 = 4k-84
\n" ); document.write( "9 = 3k-84
\n" ); document.write( "93 = 3k
\n" ); document.write( "31 years = k (Kylie's age)\r
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