document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=881402>Question 881402</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In the North Chicago area, an 820-square-foot apartment rents for $1510 per month. A 970-square-foot apartment rents for $1660. Suppose that the relation between area and rent is linear.<BR>\n" );
document.write( "A. Find a linear function that relates the rent, R to its area, x.<BR>\n" );
document.write( "B. Predict the rent of a 900-square-foot apartment.<BR>\n" );
document.write( "C. If the rent of an apartment is $1300 per month, how big would you expect it to be? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #532201 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=532201\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When you plot a graph, whatever you plot<BR>\n" );
document.write( "on the vertical axis DEPENDS on what you<BR>\n" );
document.write( "plot on the horizontal axis.<BR>\n" );
document.write( "The INDEPENDENT variable is plotted on<BR>\n" );
document.write( "the horizontal axis.<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "In this case, area in square feet is<BR>\n" );
document.write( "on the horizontal axis, and<BR>\n" );
document.write( "the monthly rent is on the vertical axis<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = area of an apartment in square feet<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+ ALIGN=MIDDLE  ALT=\"+R+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the monthly rent of an apartment<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "You are given the poihnts<BR>\n" );
document.write( "( 820, 1510 ) and<BR>\n" );
document.write( "( 970, 1660 )<BR>\n" );
document.write( "Use the point-slope formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+%28+1660+-+1510+%29+%2F+%28+970+-+820+%29+ ALIGN=MIDDLE  ALT=\"+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+%28+1660+-+1510+%29+%2F+%28+970+-+820+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+150+%2F+150+ ALIGN=MIDDLE  ALT=\"+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+150+%2F+150+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+1+ ALIGN=MIDDLE  ALT=\"+%28+R+-+1510+%29+%2F+%28+x+-+820+%29+=+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+-+1510+=+x+-+820+ ALIGN=MIDDLE  ALT=\"+R+-+1510+=+x+-+820+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(A)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+=+x+%2B+690+ ALIGN=MIDDLE  ALT=\"+R+=+x+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "( 820, 1510 )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1510+=+820+%2B+690+ ALIGN=MIDDLE  ALT=\"+1510+=+820+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1510+=+1510+ ALIGN=MIDDLE  ALT=\"+1510+=+1510+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "(B)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+900+ ALIGN=MIDDLE  ALT=\"+x+=+900+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+=+x+%2B+690+ ALIGN=MIDDLE  ALT=\"+R+=+x+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+=+900+%2B+690+ ALIGN=MIDDLE  ALT=\"+R+=+900+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+=+1590+ ALIGN=MIDDLE  ALT=\"+R+=+1590+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The rent is $1,590<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "(C)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+R+=+x+%2B+690+ ALIGN=MIDDLE  ALT=\"+R+=+x+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1300+=+x+%2B+690+ ALIGN=MIDDLE  ALT=\"+1300+=+x+%2B+690+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+610+ ALIGN=MIDDLE  ALT=\"+x+=+610+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The area is 610 square feet\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );