document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=917810>Question 917810</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Identify the lines that are perpendicular:\r<BR>\n" );
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document.write( "LINES:\r<BR>\n" );
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document.write( "http://my.thinkwell.com/questionbank/92001-93000/92176/img/243357.gif </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #556814 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20850)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=556814\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "you got\r<BR>\n" );
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document.write( "line 1.    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=2 ALIGN=MIDDLE  ALT=\"y=2\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "line 2.   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=+%281%2F5%29x-3 ALIGN=MIDDLE  ALT=\"y=+%281%2F5%29x-3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "line 3.    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=-4 ALIGN=MIDDLE  ALT=\"y=-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "line 4.  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=+-5%28x%2B2%29+ ALIGN=MIDDLE  ALT=\"y=+-5%28x%2B2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "by definition, perpendicular lines have slopes negative reciprocal to each other\r<BR>\n" );
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document.write( "line 1.    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=2 ALIGN=MIDDLE  ALT=\"y=2\"   DISABLED_style= \"max-width:90%; height:auto;\" > ....slope is zero, line is parallel to x-axis<BR>\n" );
document.write( "line 2.   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=highlight%28-%281%2F5%29%29x-3 ALIGN=MIDDLE  ALT=\"y=highlight%28-%281%2F5%29%29x-3\"   DISABLED_style= \"max-width:90%; height:auto;\" >... slope is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B1%5D=1%2F5 ALIGN=MIDDLE  ALT=\"m%5B1%5D=1%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "line 3.    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=-4 ALIGN=MIDDLE  ALT=\"y=-4\"   DISABLED_style= \"max-width:90%; height:auto;\" >....slope is zero, line is parallel to x-axis<BR>\n" );
document.write( "line 4.  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=+highlight%28-5%29%28x%2B2%29 ALIGN=MIDDLE  ALT=\"y=+highlight%28-5%29%28x%2B2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >........slope is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B2%5D=-5 ALIGN=MIDDLE  ALT=\"m%5B2%5D=-5\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "check if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B1%5D=-1%2Fm%5B2%5D ALIGN=MIDDLE  ALT=\"m%5B1%5D=-1%2Fm%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >; if yes, then lines are perpendicular\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F5=-1%2F%28-5%29 ALIGN=MIDDLE  ALT=\"1%2F5=-1%2F%28-5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F5=1%2F5 ALIGN=MIDDLE  ALT=\"1%2F5=1%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" > ...true, so lines 2 and 4 are perpendicular\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+%281%2F5%29x-3%2C+-5%28x%2B2%29%29+ ALIGN=MIDDLE  ALT=\"+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+%281%2F5%29x-3%2C+-5%28x%2B2%29%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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