document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1037782>Question 1037782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose there is a linear relationship between price and demand for an object. Demand for a video game is 1000 units when the price is $40 and 2000 units when the price is $20? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #652489 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=652489\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The description gives two points on a line, (x,y) for Demand for y and Price for x, if you want those ways to assign the quantities.  These would be the points  (40,1000) and (20,2000).  Find the line which fits the form  y=mx+b.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-mx=b ALIGN=MIDDLE  ALT=\"y-mx=b\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=y-mx ALIGN=MIDDLE  ALT=\"b=y-mx\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Pick either point.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1000-%28%282000-1000%29%2F%2820-40%29%2940 ALIGN=MIDDLE  ALT=\"b=1000-%28%282000-1000%29%2F%2820-40%29%2940\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1000-%281000%2F%28-20%29%29%2A40 ALIGN=MIDDLE  ALT=\"b=1000-%281000%2F%28-20%29%29%2A40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1000%2B%28100%2F2%29%2A40 ALIGN=MIDDLE  ALT=\"b=1000%2B%28100%2F2%29%2A40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1000%2B50%2A40 ALIGN=MIDDLE  ALT=\"b=1000%2B50%2A40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=1000%2B2000 ALIGN=MIDDLE  ALT=\"b=1000%2B2000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b=3000 ALIGN=MIDDLE  ALT=\"b=3000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "Look into one of the steps to see m=-50.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=-50x%2B3000%29 ALIGN=MIDDLE  ALT=\"highlight%28y=-50x%2B3000%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "That is not the only way to solve the example.  I used only slope-intercept form, but the point-slope form can be used instead and later adjusted to slope-intercept form.  Which way to assign the variables and what \"names\" for variables you use can be changed.  I chose x and y and assigned as done.  This was DEMAND as a function of unit price. </SPAN>\n" );
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