document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=317695>Question 317695</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If the lines whose equations are 3x+y-8=0 and -2x+by+9=0 are perpendicular, what is the value of b?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #227510 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=227510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  If the lines whose equations are 3x+y-8=0 and -2x+by+9=0 are perpendicular, what is the value of b?<BR>\n" );
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document.write( "Find the slope of 3x+y-8=0<BR>\n" );
document.write( "y = -3x + 8<BR>\n" );
document.write( "slope = -3<BR>\n" );
document.write( "The slope of lines perpendicular is the negative inverse, m = +1/3<BR>\n" );
document.write( "Put -2x+by+9=0 into slope-intercept form (that means solve for y)<BR>\n" );
document.write( "by = 2x - 9<BR>\n" );
document.write( "y = (2/b)x - 9/b<BR>\n" );
document.write( "2/b is the slope, and it = 1/3<BR>\n" );
document.write( "2/b = 1/3<BR>\n" );
document.write( "b = 6<BR>\n" );
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