document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=68476>Question 68476</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  B y= 3x-4/7  C y=-1/3x+4/7 D y= 1/3x-4/7\r<BR>\n" );
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document.write( "Please instruct me on how to do this </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #48795 by </B><A HREF=/tutors/aboutme.mpl?userid=funmath><B>funmath(2933)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=funmath><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=48795\">put this solution on YOUR website!</A><BR><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  B y= 3x-4/7  C y=-1/3x+4/7 D y= 1/3x-4/7\r<BR>\n" );
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document.write( "Perpendicular lines have slopes that are negative reciprocals of each other.  (That means that they have opposite signs and are upside down.)<BR>\n" );
document.write( "When equations are in slope intercept form:  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=mx%2Bb%29 ALIGN=MIDDLE  ALT=\"highlight%28y=mx%2Bb%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, we know that the slope is m.<BR>\n" );
document.write( "A <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=highlight%284%2F7%29x-3 ALIGN=MIDDLE  ALT=\"y=highlight%284%2F7%29x-3\"   DISABLED_style= \"max-width:90%; height:auto;\" > m=4/7<BR>\n" );
document.write( "B <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=highlight%283%29x-4%2F7 ALIGN=MIDDLE  ALT=\"y=highlight%283%29x-4%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" > m=3<BR>\n" );
document.write( "C <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=highlight%28-1%2F3%29x%2B4%2F7 ALIGN=MIDDLE  ALT=\"y=highlight%28-1%2F3%29x%2B4%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" > m=-1/3<BR>\n" );
document.write( "D <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=highlight%281%2F3%29x-4%2F7 ALIGN=MIDDLE  ALT=\"y=highlight%281%2F3%29x-4%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" > m=1/3<BR>\n" );
document.write( "B and C have slopes that are opposite signs and reciprocals of each other, so they are perpendicular.<BR>\n" );
document.write( "Happy Calculating!!! </SPAN>\n" );
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