document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=690256>Question 690256</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For what value of a are the equations 3x+12y=-6 and 6y=ax+9 perpendicular?<BR>\n" );
document.write( "A. 26<BR>\n" );
document.write( "B. 24<BR>\n" );
document.write( "C. -12<BR>\n" );
document.write( "D. -1.5 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #426226 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=426226\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3x+12y= -6 <BR>\n" );
document.write( "solve for y<BR>\n" );
document.write( "12y = -3x - 6<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-3%2F12%29x+-+6%2F12 ALIGN=MIDDLE  ALT=\"%28-3%2F12%29x+-+6%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-1%2F4%29x+-+1%2F2 ALIGN=MIDDLE  ALT=\"%28-1%2F4%29x+-+1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "slope is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1%2F4 ALIGN=MIDDLE  ALT=\"-1%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" >, a perpendicular line will have a slope of negative inverse.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "A perpendicular line will have a slope of 4<BR>\n" );
document.write( "...<BR>\n" );
document.write( "6y = ax+9<BR>\n" );
document.write( "y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28a%2F6%29x+%2B+9%2F6 ALIGN=MIDDLE  ALT=\"%28a%2F6%29x+%2B+9%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2F6+=+4 ALIGN=MIDDLE  ALT=\"a%2F6+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" > ==> multiply both sides by 6<BR>\n" );
document.write( "a = 24<BR>\n" );
document.write( "...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28Choice_B%29 ALIGN=MIDDLE  ALT=\"highlight_green%28Choice_B%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "………………………<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );