document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=446779>Question 446779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help determining whether each pair of equations represents perpendicular lines.<BR>\n" );
document.write( "y = –x + 7, y – x = 3\r<BR>\n" );
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document.write( "Thank you so much! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #307674 by </B><A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><B>sudhanshu_kmr(1152)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><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=sudhanshu_kmr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=307674\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "y = -x +7<BR>\n" );
document.write( "slope of first equation = -1\r<BR>\n" );
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document.write( "y - x = 3 <BR>\n" );
document.write( " =>  y = x+3\r<BR>\n" );
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document.write( "slope of second equation = 1\r<BR>\n" );
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document.write( "product of slopes = 1 * -1 =  -1 \r<BR>\n" );
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document.write( "so, these are perpendicular lines.<BR>\n" );
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