document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=684925>Question 684925</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am supposed to determine whether the following pairs of lines are (a) parallel, (b) perpendicular or (c)neither, all this without graphing. I don't know how. Please help me.<BR>\n" );
document.write( "5x-6y=19<BR>\n" );
document.write( "6x+5y=-30 \r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #424252 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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=424252\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> First, solve each line for y, to put into slope intercept format as y=mx+b.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "5x - 6y = 19<BR>\n" );
document.write( "6y = 5x - 19<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%285%2F6%29x+-+19%2F6 ALIGN=MIDDLE  ALT=\"%285%2F6%29x+-+19%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "6x + 5y = -30<BR>\n" );
document.write( "5y = -6x - 30<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-6%2F5%29x+-+30%2F5 ALIGN=MIDDLE  ALT=\"%28-6%2F5%29x+-+30%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "The slopes are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F6 ALIGN=MIDDLE  ALT=\"5%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-6%2F5 ALIGN=MIDDLE  ALT=\"-6%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" >, which are negative inverses/reciprocals.  <BR>\n" );
document.write( "...<BR>\n" );
document.write( "Perpendicular lines have negative inverse/reciprocal slopes.<BR>\n" );
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document.write( "Parallel lines have the same slope.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "These are B, perpendicular.<BR>\n" );
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