document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=20>Question 20</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can a linear equation have two variables? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #7 by </B><A HREF=/tutors/aboutme.mpl?userid=ichudov><B>ichudov(507)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ichudov><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=ichudov><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=7\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Sure it can. If a single linear equation has two variables, then it defines not one solution, but many solutions. If you plot the solutions on a graph, where one axis is one variable and another axis is another variable, you get a straight LINE. That's why the equation is called LINEar.\r<BR>\n" );
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document.write( "Example of a linear equation with two variables: y-x=3. Its graph: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28+300%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+x-3%29+ ALIGN=MIDDLE  ALT=\"graph%28+300%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+x-3%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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