document.write( "Question 683682: One person is 3 years old. Another is 57 years old. I need to write an equation which models how old each person will be when the older person is three times as old as the younger person. \n" ); document.write( "
Algebra.Com's Answer #423694 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"+y+\" = the age of the younger person
\n" ); document.write( "Let \"+x+\" = the age of the older person
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\n" ); document.write( "I can put the equation into the form
\n" ); document.write( "\"+y+=+m%2Ax+%2B+b+\"
\n" ); document.write( "I can say
\n" ); document.write( "(1) \"+3+=+m%2A57+%2B+b+\"
\n" ); document.write( "I can also say
\n" ); document.write( "(2) \"+0+=+m%2A54+%2B+b+\" ( older person was 54 when younger person was born )
\n" ); document.write( "(2) \"+b+=+-54m+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+3+=+57m+-54m+\"
\n" ); document.write( "(1) \"+3m+=+3+\"
\n" ); document.write( "(1) \"+m+=+1+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+b+=+-54m+\"
\n" ); document.write( "(2) \"+b+=+-54+\"
\n" ); document.write( "So, the equation is
\n" ); document.write( "\"+y+=+x+-+54+\"
\n" ); document.write( "Here's the plot
\n" ); document.write( "\"+graph%28+400%2C+400%2C+-5%2C+100%2C+-5%2C+70%2C++x+-+54+%29+\"\r
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