document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1065895>Question 1065895</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if a teacher plotted points on the board in which no three are collinear and her student came up with 45 lines ,how many points were on the board?\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #681073 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><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/cgi-bin/show-face.mpl?user=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=681073\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n ALIGN=MIDDLE  ALT=\"n\"   DISABLED_style= \"max-width:90%; height:auto;\" >= number of points<BR>\n" );
document.write( "Each point can be combined with the other points to make <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n-1 ALIGN=MIDDLE  ALT=\"n-1\"   DISABLED_style= \"max-width:90%; height:auto;\" > different rays.<BR>\n" );
document.write( "That would amount to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%28n-1%29 ALIGN=MIDDLE  ALT=\"m%28n-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > rays,<BR>\n" );
document.write( "but each line would correspond to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2 ALIGN=MIDDLE  ALT=\"2\"   DISABLED_style= \"max-width:90%; height:auto;\" > rays,<BR>\n" );
document.write( "so there are really <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%28n-1%29%2F2=45 ALIGN=MIDDLE  ALT=\"n%28n-1%29%2F2=45\"   DISABLED_style= \"max-width:90%; height:auto;\" > lines.<BR>\n" );
document.write( "That is the equation to solve.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%28n-1%29%2F2=45 ALIGN=MIDDLE  ALT=\"n%28n-1%29%2F2=45\"   DISABLED_style= \"max-width:90%; height:auto;\" >--><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%28n-1%29=2%2A45 ALIGN=MIDDLE  ALT=\"n%28n-1%29=2%2A45\"   DISABLED_style= \"max-width:90%; height:auto;\" >--><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%28n-1%29=90 ALIGN=MIDDLE  ALT=\"n%28n-1%29=90\"   DISABLED_style= \"max-width:90%; height:auto;\" >--><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28highlight%28n=10%29%2Cn-1=9%29 ALIGN=MIDDLE  ALT=\"system%28highlight%28n=10%29%2Cn-1=9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );