document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=853745>Question 853745</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, my question is and i am having a lot of trouble with it even with 2 other friends is<BR>\n" );
document.write( "A father is nine times the age of his son. in 5 years he will be 4 times the age of his son. how old are they now.<BR>\n" );
document.write( "(i need the working out for it and it needs to be done using algebra help please! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #514219 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=514219\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \"A father is nine times the age of his son. In 5 years, he will be 4 times the age of his son. How old are they now?\r<BR>\n" );
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document.write( "x = age of son now<BR>\n" );
document.write( "y = age of father now\r<BR>\n" );
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document.write( "y=5x for \"now\".<BR>\n" );
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document.write( "Their ages five years from now are these:<BR>\n" );
document.write( "x+5 = age of son in five more years<BR>\n" );
document.write( "y+5 = age of father in five more years<BR>\n" );
document.write( "y+5=4(x+5) ---- He will be four times the age of his son.\r<BR>\n" );
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document.write( "SUMMARY OF EQUATIONS:<BR>\n" );
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document.write( "y=5x<BR>\n" );
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document.write( "y+5=4(x+5)<BR>\n" );
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document.write( "SOLVING THE SIMULTANEOUS EQUATIONS<BR>\n" );
document.write( "y+5=4x+20 from the 'in five years' equation;<BR>\n" );
document.write( "4x+20=y+5<BR>\n" );
document.write( "4x-y=5-20<BR>\n" );
document.write( "y-4x=15<BR>\n" );
document.write( "Substitute y using the 'now' equation;<BR>\n" );
document.write( "5x-4x=15<BR>\n" );
document.write( "1*x=15<BR>\n" );
document.write( "x=15--------------part of the answer.  The son, now.<BR>\n" );
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document.write( "Now compute y.<BR>\n" );
document.write( "y=5x<BR>\n" );
document.write( "y=5*15<BR>\n" );
document.write( "y=75-------------other part of answer.  The father, now.<BR>\n" );
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