document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=713507>Question 713507</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Company C uses a linear relationship and for 100 miles a day the rental cost is $50, while if you drive 400 miles a day the cost is $68. What is the formula? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #438470 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39630)</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=438470\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Assign those numbers to an arrangement of (x,y) coordinates; TWO of them.\r<BR>\n" );
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document.write( "Do as x for miles and y for cost.  The points are (100, 50) and (400, 68).  Two points - Find the linear equation.\r<BR>\n" );
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document.write( "Slope, m=(68-50)/(400-100)<BR>\n" );
document.write( "m=18/300, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=3%2F50 ALIGN=MIDDLE  ALT=\"m=3%2F50\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Point-Slope Form For a Line: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y-y%5B0%5D=m%28x-x%5B0%5D%29 ALIGN=MIDDLE  ALT=\"y-y%5B0%5D=m%28x-x%5B0%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  Substitute for m, Pick either of the data points for (<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5B0%5D ALIGN=MIDDLE  ALT=\"x%5B0%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y%5B0%5D ALIGN=MIDDLE  ALT=\"y%5B0%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >).  Simplify. </SPAN>\n" );
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