document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149331>Question 149331</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the following:\r<BR>\n" );
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document.write( "Passing through (5,-9) and perpendicular to x + 7y = 12 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109552 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=109552\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Passing through (5,-9) and perpendicular to x + 7y = 12<BR>\n" );
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document.write( "Find the slope of x + 7y = 12<BR>\n" );
document.write( "Put in standard form y = mx+b<BR>\n" );
document.write( "y = -x/7 + 12/7<BR>\n" );
document.write( "Slope m = -1/7<BR>\n" );
document.write( "The slope of a perpendicular line is +7.<BR>\n" );
document.write( "y-y1 = m(x-x1)<BR>\n" );
document.write( "y-(-9) = 7*(x-5)<BR>\n" );
document.write( "y+9 = 7x-35<BR>\n" );
document.write( "7x-y = 44<BR>\n" );
document.write( "To check: 7*5 -(-9) = 44, so it does go thru the point (5,-9) </SPAN>\n" );
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