document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=670771>Question 670771</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Okay so my problem is to find the line that passes through (1,4) and (r,5) but my M = undefined. What in the world do I do. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417148 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=417148\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If the slope m is undefined, then only one thing is possible: you are dividing by zero.\r<BR>\n" );
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document.write( "The only way this can happen is if x2 - x1 = 0\r<BR>\n" );
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document.write( "So...\r<BR>\n" );
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document.write( "r - 1 = 0\r<BR>\n" );
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document.write( "r = 1\r<BR>\n" );
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document.write( "The equation of this line is then x = 1 since this is a vertical line (with undefined slope) that goes through both (1, 4) and (1,5) </SPAN>\n" );
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