document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=121922>Question 121922</A>: <I><SPAN STYLE=\"word-break: break-all;\"> determine which two equations represent perpendicular lines\r<BR>\n" );
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document.write( "A. y= 4/7x-3\r<BR>\n" );
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document.write( "B. y=3x-4/7\r<BR>\n" );
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document.write( "C. y= -1/3x+4/7\r<BR>\n" );
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document.write( "D. y= 1/3x-4/7\r<BR>\n" );
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document.write( "i am completely confused </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #89556 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=89556\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Perpendicular lines have slopes that are negative reciprocals of each other.<BR>\n" );
document.write( "In other words, <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B1%5D%2Am%5B2%5D=-1 ALIGN=MIDDLE  ALT=\"m%5B1%5D%2Am%5B2%5D=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The product of the slopes is -1.<BR>\n" );
document.write( "All of your equations are in slope-intercept form.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=mx%2Bb ALIGN=MIDDLE  ALT=\"y=mx%2Bb\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B1%5D=4%2F7 ALIGN=MIDDLE  ALT=\"m%5B1%5D=4%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B2%5D=3 ALIGN=MIDDLE  ALT=\"m%5B2%5D=3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B3%5D=-%281%2F3%29 ALIGN=MIDDLE  ALT=\"m%5B3%5D=-%281%2F3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%5B4%5D=1%2F3 ALIGN=MIDDLE  ALT=\"m%5B4%5D=1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "From your 4 choices, the answer is B and C since<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2A%28-1%2F3%29=-1 ALIGN=MIDDLE  ALT=\"3%2A%28-1%2F3%29=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Graphing the equations, you see they are perpendicular. <BR>\n" );
document.write( " <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+300%2C+-5%2C+5%2C+-5%2C+5%2C+3x-4%2F7+%0D%0A%2C+-%281%2F3%29x%2B4%2F7+%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+300%2C+-5%2C+5%2C+-5%2C+5%2C+3x-4%2F7+%0D%0A%2C+-%281%2F3%29x%2B4%2F7+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >  </SPAN>\n" );
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