document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=30202>Question 30202</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I would appreciate any help to the following problem #25.  Determine whether each pair of lines is parallel, perpendicular, or neither.<BR>\n" );
document.write( "x + y = 5<BR>\n" );
document.write( "x - y = 1\r<BR>\n" );
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document.write( "Thank you. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #16887 by </B><A HREF=/tutors/aboutme.mpl?userid=longjonsilver><B>longjonsilver(2297)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=longjonsilver><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=longjonsilver><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=16887\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x + y = 5 --> y = -x + 5<BR>\n" );
document.write( "x - y = 1 --> y = x - 1\r<BR>\n" );
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document.write( "Written in this form, the coefficient of x is the gradient... we have -1 and +1. They are not parallel.\r<BR>\n" );
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document.write( "If (grad1)*(grad2) = -1 then the lines are perpendicular.\r<BR>\n" );
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document.write( "-1*1 is -1... so the 2 lines are perpendicular.\r<BR>\n" );
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document.write( "jon.<BR>\n" );
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