document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=21959>Question 21959</A>: <I><SPAN STYLE=\"word-break: break-all;\"> My line is (-7, 2) ; (-7, -2).  Obviously this is a horizontal line.  Also, this does not have a y-intercept.  How would I find the equation of this line?  In the formula y = mx+b, would \"b\" represent the x-intercept in this case?  Thank you in advance! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #10580 by </B><A HREF=/tutors/aboutme.mpl?userid=anjikumar><B>anjikumar(3)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=anjikumar><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=10580\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You are right that the line (-7,2) ; (-7,-2) is a horizontal line which can be stated as (y=x).\r<BR>\n" );
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document.write( "Using the formula y=mx+b,  the slope \"m\" is 0, since it is a horizontal line and  \"b\" is where it intersects the y-axis, in this case, at -7.\r<BR>\n" );
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document.write( "Therefore, the equation of a horizontal line at -7, is y=x-7.\r<BR>\n" );
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document.write( "All horizontal lines will be written this way, for example, y=x+5, if it is at +5. y=x is basically the x-axis at y=0, so you can go up or down on the y-axis by adding or subtracting to that basic equation. \r<BR>\n" );
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