document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1202252>Question 1202252</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If y varies directly as x and y=12 when x=-3, find y when x=7 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #836947 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=836947\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "If you have a requirement to find the formula relating x and y, for repeated us later on, then you can do as the other tutor did to find the proportionality constant to find the answer.<br><BR>\n" );
document.write( "But if, as your post suggests, you only need to find the answer for this one case, then there is no need to go to all that work.<br><BR>\n" );
document.write( "Since the variation is direct, when the value of x changes the value of y changes by the same factor.<br><BR>\n" );
document.write( "In this example, the value of x changes from -3 to +7, a factor of (-7/3), so the value of y changes by a factor of (-7/3).<br><BR>\n" );
document.write( "ANSWER: y = 12*(-7/3) = 4(-7) = -28<br><BR>\n" );
document.write( "Note that it is very unusual in the real world to have a direct variation in which the values of the variables can be both positive and negative....<br><BR>\n" );
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