document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1021421>Question 1021421</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Write the equation -2x + 6y = 9 in polar form. <BR>\n" );
document.write( "9sqrt(10)/20 = r cos (theta - 108)<BR>\n" );
document.write( "9sqrt(10)/20 = r cos (theta - 72)<BR>\n" );
document.write( "7sqrt(10)/20 = r cos (theta - 108)<BR>\n" );
document.write( "7sqrt(10)/20 = r cos (theta - 72)\r<BR>\n" );
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document.write( "I'm really stuck here so any help would be very much appreciated, thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #637220 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=637220\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -2x +6y = 9 <BR>\n" );
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document.write( "standard form is<BR>\n" );
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document.write( "-2x +6y -9 = 0 then<BR>\n" );
document.write( "2x -6y +9 = 0<BR>\n" );
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document.write( "A=2, B=-6, C=9<BR>\n" );
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document.write( "+ or - square root(4+36) = + or - 2square root(10)<BR>\n" );
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document.write( "use -2square root(10), the minus is opposite sign of C<BR>\n" );
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document.write( "(2x /(-2square root(10)) -6y/(-2square root(10)) +(9 / (-2square root(10)) = 0<BR>\n" );
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document.write( "multiply the numerator and denominator of each fraction by square root(10)<BR>\n" );
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document.write( "(-2square root(10) / 20)x +(6square root(10) / 20)y -(9square root(10) / 20) = 0<BR>\n" );
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document.write( "note that -cos, +sin implies quadrant II<BR>\n" );
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document.write( "phi = cos^(-1) of (-2square root(10) / 20) = 108.434948822<BR>\n" );
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document.write( "correct answer is<BR>\n" );
document.write( "(9 * square root(10) / 20) = r * cos(theta - 108)<BR>\n" );
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document.write( "note that * means multiply<BR>\n" );
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