document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=717845>Question 717845</A>: <I><SPAN STYLE=\"word-break: break-all;\"> find the slope of the line (1,-9) (4,-9)\r<BR>\n" );
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document.write( "indicate whether the line through the point rises, falls, is horizontal or vertical  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #440573 by </B><A HREF=/tutors/aboutme.mpl?userid=algebrahouse.com><B>algebrahouse.com(1659)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=algebrahouse.com><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=algebrahouse.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=440573\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y2 - y1<BR>\n" );
document.write( "-------- = slope  {\"rise over run\"}<BR>\n" );
document.write( "x2 - x1\r<BR>\n" );
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document.write( "(1,-9) and (4,-9) are the coordinates (x1,y1) and (x2,y2)\r<BR>\n" );
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document.write( "-9 - (-9)<BR>\n" );
document.write( "---------- = slope {substituted coordinates into slope formula}<BR>\n" );
document.write( "4 - 1\r<BR>\n" );
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document.write( "-9 + 9<BR>\n" );
document.write( "------- = slope {simplified the numerator}<BR>\n" );
document.write( "3\r<BR>\n" );
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document.write( "0<BR>\n" );
document.write( "-- = slope {added in the numerator}<BR>\n" );
document.write( "3\r<BR>\n" );
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document.write( "= 0   {divided}\r<BR>\n" );
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document.write( "slope is 0<BR>\n" );
document.write( "A line with a slope of zero has no \"rise\",<BR>\n" );
document.write( "it is a horizontal line\r<BR>\n" );
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document.write( "Also, once you notice the y-coordinates are the same, you can determine it is a horizontal line.   If the x-coordinates are the same, it is a vertical line.  If it is a positive, slope the line slants up and to the right.  If it is a negative slope, the line slants down and to the right.<BR>\n" );
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