document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=775865>Question 775865</A>: <I><SPAN STYLE=\"word-break: break-all;\"> given the two points, A(5,-1) and B (15,4)<BR>\n" );
document.write( "a. find the slope of the line joining the points A and B<BR>\n" );
document.write( "b. if EF is perpendicular to AB, find the slope of EF? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #473228 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=473228\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x1		y1	x2	y2				<BR>\n" );
document.write( "5      		-1      	15      	4    				<BR>\n" );
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document.write( "slope m =		(y2-y1)/(x2-x1)						<BR>\n" );
document.write( "(	4    	-	-1    	)/(	15    	-	5    	)<BR>\n" );
document.write( "(	5    	/	10    	)  				<BR>\n" );
document.write( "m=		  1/ 2						 \r<BR>\n" );
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document.write( "slope of a perpendicular line will be the negative reciprocal of the slope of the given line\r<BR>\n" );
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document.write( "m=-2 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );