document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=785281>Question 785281</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the value of k so that the line containing the points (3,k) and (&#8722;3,4) is perpendicular to the line containing the points (&#8722;7,1) and (&#8722;1,2). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #477496 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=477496\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The slope of the line containing the points (&#8722;7,1) and (&#8722;1,2) is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282-1%29%2F%28-1-%28-7%29%29=1%2F%28-1%2B7%29=1%2F6 ALIGN=MIDDLE  ALT=\"%282-1%29%2F%28-1-%28-7%29%29=1%2F%28-1%2B7%29=1%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The slope of the line containing the points (3,k) and (&#8722;3,4) is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28k-4%29%2F%283-%28-3%29%29=%28k-4%29%2F%283%2B3%29=%28k-4%29%2F6 ALIGN=MIDDLE  ALT=\"%28k-4%29%2F%283-%28-3%29%29=%28k-4%29%2F%283%2B3%29=%28k-4%29%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "For two lines to be perpendicular, the product of their slopes must be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1 ALIGN=MIDDLE  ALT=\"-1\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2F6%29%2A%28%28k-4%29%2F6%29=-1 ALIGN=MIDDLE  ALT=\"%281%2F6%29%2A%28%28k-4%29%2F6%29=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28k-4%29%2F36=-1 ALIGN=MIDDLE  ALT=\"%28k-4%29%2F36=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k-4=-36 ALIGN=MIDDLE  ALT=\"k-4=-36\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k=-36%2B4 ALIGN=MIDDLE  ALT=\"k=-36%2B4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28k=-32%29 ALIGN=MIDDLE  ALT=\"highlight%28k=-32%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28300%2C300%2C-30%2C20%2C-40%2C10%2C%0D%0Agrid%280%29%2C+red%28line%28-31%2C-3%2C23%2C6%29%29%2C%0D%0Agreen%28line%285%2C-44%2C-4%2C10%29%29%2C%0D%0Agreen%28circle%283%2C-32%2C0.5%29%29%2Cgreen%28circle%28-3%2C4%2C0.5%29%29%2C%0D%0Ared%28circle%28-7%2C1%2C0.5%29%29%2Cred%28circle%28-1%2C2%2C0.5%29%29%2C%0D%0Ared%28circle%28-7%2C1%2C0.3%29%29%2Cred%28circle%28-1%2C2%2C0.3%29%29%0D%0A%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );