document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=720029>Question 720029</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the value of k so that the line containing the points (&#8722;7,&#8722;7) and (3,k) is perpendicular to the line y=&#8722;1/4x+1.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441626 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=441626\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the value of k so that the line containing the points (&#8722;7,&#8722;7) and (3,k) is perpendicular to the line y=&#8722;1/4x+1. \r<BR>\n" );
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document.write( "y= -(1/4)x +1<BR>\n" );
document.write( "slope = -(1/4)\r<BR>\n" );
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document.write( "a line perpendicular to this line will have a slope of 4  ( negative reciprocal)\r<BR>\n" );
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document.write( "m= (y2-y1)/(x2-x1)\r<BR>\n" );
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document.write( "4 = (k-(-7))/(3-(-7))\r<BR>\n" );
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document.write( "4= (k+7)/10\r<BR>\n" );
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document.write( "k+7=40<BR>\n" );
document.write( "k=33 </SPAN>\n" );
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