document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1036379>Question 1036379</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the value of a if b(3,4) c(a, 6) and d(a+5, 23) are collinear, explain. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #651100 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=651100\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the value of a if b(3,4) c(a, 6) and d(a+5, 23) are collinear<BR>\n" );
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document.write( "If they're colinear the slopes have to be equal.<BR>\n" );
document.write( "slope, m = diffy/diffx<BR>\n" );
document.write( "m1 of bc = (6-4)/(a-3) = 2/(a-3)<BR>\n" );
document.write( "m2 of bd = (23-4)/(a+5 - 3) = 19/(a+2)<BR>\n" );
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document.write( "m1 = m2<BR>\n" );
document.write( "2/(a-3) = 19/(a+2)<BR>\n" );
document.write( "Cross multiply<BR>\n" );
document.write( "2(a+2) = 19(a-3)<BR>\n" );
document.write( "2a+4 = 19a-57<BR>\n" );
document.write( "17a = 61<BR>\n" );
document.write( "a = 61/17\r<BR>\n" );
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