document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=401621>Question 401621</A>: <I><SPAN STYLE=\"word-break: break-all;\"> WHy does a horizontal line have a slope of 0 when a vertical line has an undefined slope? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #284217 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=284217\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Any two points on a horizontal line have coordinates (a, b) and (c, b).  The slope is then equal to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28b-b%29%2F%28c-a%29+=+0%2F%28c-a%29+=+0 ALIGN=MIDDLE  ALT=\"%28b-b%29%2F%28c-a%29+=+0%2F%28c-a%29+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" >, given a is not equal to b.\r<BR>\n" );
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document.write( "Any two points on a vertical line have coordinates (d, e) and (d, f) (assuming e not equal to f).  The slope is then equal to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28f-e%29%2F%28d-d%29+=+%28f-e%29%2F0 ALIGN=MIDDLE  ALT=\"%28f-e%29%2F%28d-d%29+=+%28f-e%29%2F0\"   DISABLED_style= \"max-width:90%; height:auto;\" > = undefined, because division by 0 is impossible. </SPAN>\n" );
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