document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=406852>Question 406852</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Write the equation of the tangent to circle <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2%2B%28y-4%29%5E2=16+ ALIGN=MIDDLE  ALT=\"+x%5E2%2B%28y-4%29%5E2=16+\"   DISABLED_style= \"max-width:90%; height:auto;\" > at P(-4,4) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #286997 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=286997\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Write the equation of the tangent to circle <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5E2%2B%28y-4%29%5E2=16+ ALIGN=MIDDLE  ALT=\"+x%5E2%2B%28y-4%29%5E2=16+\"   DISABLED_style= \"max-width:90%; height:auto;\" > at P(-4,4)<BR>\n" );
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document.write( "x^2+(y-4)^2=16<BR>\n" );
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document.write( "x^2 + y^2 - 8y + 16 = 16<BR>\n" );
document.write( "2xdx + 2ydy - 8dy = 0<BR>\n" );
document.write( "xdx + (y-4)dy = 0<BR>\n" );
document.write( "xdx = (4-y)dy<BR>\n" );
document.write( "dy/dx = x/(4-y)<BR>\n" );
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document.write( "@ (-4,4):y' = -4/0 --> undefined, parallel to y-axis<BR>\n" );
document.write( "--> x = -4<BR>\n" );
document.write( " <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );