document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=708800>Question 708800</A>: <I><SPAN STYLE=\"word-break: break-all;\"> at the present time a man is four times as old as his son six years ago he was 10 times as old. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #436255 by </B><A HREF=/tutors/aboutme.mpl?userid=Stitch><B>Stitch(470)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Stitch><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=436255\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let A = th eage of the dad<BR>\n" );
document.write( "Let B = the age of the son<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+4B ALIGN=MIDDLE  ALT=\"A+=+4B\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+-+6+=+10%2A%28B-6%29 ALIGN=MIDDLE  ALT=\"A+-+6+=+10%2A%28B-6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "Since equation 1 is solved for A, plug 4B into equation 2 for A<BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+-+6+=+10%2A%28B-6%29 ALIGN=MIDDLE  ALT=\"A+-+6+=+10%2A%28B-6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%284B%29+-+6+=+10%2A%28B-6%29 ALIGN=MIDDLE  ALT=\"%284B%29+-+6+=+10%2A%28B-6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply the 10 through<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4B+-+6+=+10B+-+60 ALIGN=MIDDLE  ALT=\"4B+-+6+=+10B+-+60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Subtract 4B from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-6+=+6B+-+60 ALIGN=MIDDLE  ALT=\"-6+=+6B+-+60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Add 60 to both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=54+=+6B ALIGN=MIDDLE  ALT=\"54+=+6B\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Divide both sides by 6<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%289+=+B%29 ALIGN=MIDDLE  ALT=\"highlight%289+=+B%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now plug 9 into equation 1 for B<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+4B ALIGN=MIDDLE  ALT=\"A+=+4B\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+4%2A%289%29 ALIGN=MIDDLE  ALT=\"A+=+4%2A%289%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28A+=+36%29 ALIGN=MIDDLE  ALT=\"highlight_green%28A+=+36%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "______________________________________________________________________<BR>\n" );
document.write( "______________________________________________________________________<BR>\n" );
document.write( "Extra question #1:<BR>\n" );
document.write( "The line y=mx+c passes through (2'5) and (4'13). Find the m and the c.<BR>\n" );
document.write( "In that equation m is the slope and c is the Y-intercept.<BR>\n" );
document.write( "Points on a graph are given in the form (X,Y).<BR>\n" );
document.write( "The equation to find the slope of the line between to points is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m+=+%28Y2-Y1%29%2F%28X2-X1%29 ALIGN=MIDDLE  ALT=\"m+=+%28Y2-Y1%29%2F%28X2-X1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now we will plug in the values you were given to solve for m.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m+=+%2813-5%29%2F%284-2%29 ALIGN=MIDDLE  ALT=\"m+=+%2813-5%29%2F%284-2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m+=+8%2F2 ALIGN=MIDDLE  ALT=\"m+=+8%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28m+=+4%29 ALIGN=MIDDLE  ALT=\"highlight_green%28m+=+4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Since we know what m equals, we can rewrite the equation of the line.<BR>\n" );
document.write( "y = mx+c is now y = 4x+c<BR>\n" );
document.write( "The next step is to pick one of the points that you were gven and solve for c.<BR>\n" );
document.write( "I will you the point (2,5)<BR>\n" );
document.write( "That means that when x=2, then y=5<BR>\n" );
document.write( "Plug those values into the line equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+4x+%2B+c ALIGN=MIDDLE  ALT=\"y+=+4x+%2B+c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+4%2A2+%2B+c ALIGN=MIDDLE  ALT=\"5+=+4%2A2+%2B+c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+8+%2B+c ALIGN=MIDDLE  ALT=\"5+=+8+%2B+c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Subtract 8 from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28-3+=+c%29 ALIGN=MIDDLE  ALT=\"highlight%28-3+=+c%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The equation of the line that passes through the given points is y = 4x - 3\r<BR>\n" );
document.write( "\n" );
document.write( "______________________________________________________________________<BR>\n" );
document.write( "______________________________________________________________________<BR>\n" );
document.write( "Extra question #2:<BR>\n" );
document.write( "Twice one Number added to 3 times a nother gives 21. Find the numbers if the difference between them is 3.<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2A+%2B+3B+=+21 ALIGN=MIDDLE  ALT=\"2A+%2B+3B+=+21\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+B+%2B+3 ALIGN=MIDDLE  ALT=\"A+=+B+%2B+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Since equation 2 is solved for A, plug (B + 3) into equation 1 for A.<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2A+%2B+3B+=+21 ALIGN=MIDDLE  ALT=\"2A+%2B+3B+=+21\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2A%28B+%2B+3%29+%2B+3B+=+21 ALIGN=MIDDLE  ALT=\"2%2A%28B+%2B+3%29+%2B+3B+=+21\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply the 2 through<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2B+%2B+6+%2B+3B+=+21 ALIGN=MIDDLE  ALT=\"2B+%2B+6+%2B+3B+=+21\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Combine like terms<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5B+%2B+6+=+21 ALIGN=MIDDLE  ALT=\"5B+%2B+6+=+21\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Subtract 6 from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5B+=+15 ALIGN=MIDDLE  ALT=\"5B+=+15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Divide both sides by 5<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28B+=+3%29 ALIGN=MIDDLE  ALT=\"highlight%28B+=+3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now plug 3 into equation 2 for B.<BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+B+%2B+3 ALIGN=MIDDLE  ALT=\"A+=+B+%2B+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+%283%29+%2B+3 ALIGN=MIDDLE  ALT=\"A+=+%283%29+%2B+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28A+=+6%29 ALIGN=MIDDLE  ALT=\"highlight_green%28A+=+6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );