document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=214797>Question 214797</A>: <I><SPAN STYLE=\"word-break: break-all;\"> We are presently graphing linear equations.  I am totally lost.  gWe have to anwer a response to:<BR>\n" );
document.write( "Why the line x=4 is a vertical line? How do begin? How do I solve this? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #162278 by </B><A HREF=/tutors/aboutme.mpl?userid=drj><B>drj(1380)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=drj><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=drj><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=162278\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We are presently graphing linear equations.  I am totally lost.  We have to anwer a response to:  Why the line x=4 is a vertical line? How do begin? How do I solve this?\r<BR>\n" );
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document.write( "Step 1.  A line is given in slope-intercept form as y=mx+b where m is the slope and b is the y-intercept at point (0,b).  The y-intercept intersects the y-axis when x=0.  When we substitute x=0  into y=mx+b we get y=b.  So the point (0,b) is a point in the line.   Another point in the line is when y=0 then 0=mx+b or x=-b/m.\r<BR>\n" );
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document.write( "Step 2.  Now, why is the line vertical for x=4.  Note y can be any value as long as it has it's x-coordinate to be 4.\r<BR>\n" );
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document.write( "For example,  consider the the points (4, 0), (4, 1), and (4, -1) plot it in the graph and draw a line through these points.   What all these points have in common is that they have the x-coordinate to be 4.  In fact, you can have many y-values with an x-coordinates of 4 or x=4.\r<BR>\n" );
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document.write( "Now if y=4, then you have many points with y-coordinate of 4.  That is, points (0,4), (-1,4) and (1,4) will have the same y=4 and different values of x.  When you plot these points then these points, the line will be horizontal.\r<BR>\n" );
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document.write( "I hope the above steps were helpful.\r<BR>\n" );
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document.write( "For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.\r<BR>\n" );
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document.write( "Good luck in your studies!\r<BR>\n" );
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document.write( "Respectfully,<BR>\n" );
document.write( "Dr J<BR>\n" );
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