document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=536572>Question 536572</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the function rule for the graph:<BR>\n" );
document.write( "              x  y<BR>\n" );
document.write( "              1  20<BR>\n" );
document.write( "              2  16<BR>\n" );
document.write( "              3  12<BR>\n" );
document.write( "              4  8\r<BR>\n" );
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document.write( "? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #352448 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=352448\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> As x increases by 1 each time, y decreases by 4 each time.\r<BR>\n" );
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document.write( "So the slope is -4/1 = -4, telling us that m = -4\r<BR>\n" );
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document.write( "So the equation y = mx+b then becomes y = -4x+b\r<BR>\n" );
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document.write( "Now, when x = 1, y = 20. Plug this in to get 20 = -4(1)+b\r<BR>\n" );
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document.write( "and solve for b to get: b = 24\r<BR>\n" );
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document.write( "So the equation that models the data is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+-4x%2B24 ALIGN=MIDDLE  ALT=\"y+=+-4x%2B24\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "This is a linear equation.\r<BR>\n" );
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document.write( "Note: alternatively, you can replace 'y' with f(x) to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f%28x%29=-4x%2B24 ALIGN=MIDDLE  ALT=\"f%28x%29=-4x%2B24\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "If you need more help, email me at <a  rel=nofollow HREF=\"mailto:jim_thompson5910@hotmail.com\">jim_thompson5910@hotmail.com</a>\r<BR>\n" );
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document.write( "Jim </SPAN>\n" );
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