document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=278609>Question 278609</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine whether graphs are perpendicular:<BR>\n" );
document.write( "9x-8y=7<BR>\n" );
document.write( "9y-8x=4<BR>\n" );
document.write( "Are they perpendicular </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #202716 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=202716\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 9x-8y=7<BR>\n" );
document.write( "9y-8x=4<BR>\n" );
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document.write( "9x-8y=7<BR>\n" );
document.write( "-8y=-9x+7<BR>\n" );
document.write( "y=9x/8 - 7/8<BR>\n" );
document.write( ".<BR>\n" );
document.write( "9y-8x=4<BR>\n" );
document.write( "9y=8x+4<BR>\n" );
document.write( "y=8x/9 + 4/9<BR>\n" );
document.write( ".<BR>\n" );
document.write( "No, because in order to be perpendicular m (slope)  has to be the negative reciprocal of the slope of the other equation in the slope intercept form and these are not.<BR>\n" );
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document.write( "Ed<BR>\n" );
document.write( ".<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28500%2C500%2C-10%2C10%2C-10%2C10%2C%289x%2F8%29-7%2F8+%2C%288x%2F9%29%2B4%2F9%29 ALIGN=MIDDLE  ALT=\"graph%28500%2C500%2C-10%2C10%2C-10%2C10%2C%289x%2F8%29-7%2F8+%2C%288x%2F9%29%2B4%2F9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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