document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=745680>Question 745680</A>: <I><SPAN STYLE=\"word-break: break-all;\"> when making a phone call using a calling card a call lasting 6 minutes cost $1.60. a call lasting 13 minutes cost $3.00. Y=cost and X=minutes. Write a linear equation.\r<BR>\n" );
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document.write( "predict how much a 25 minute call cost? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #454053 by </B><A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><B>tommyt3rd(5050)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><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=tommyt3rd><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=454053\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X%5B1%5D=1.60 ALIGN=MIDDLE  ALT=\"X%5B1%5D=1.60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Y%5B1%5D=6 ALIGN=MIDDLE  ALT=\"Y%5B1%5D=6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X%5B2%5D=13 ALIGN=MIDDLE  ALT=\"X%5B2%5D=13\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Y%5B2%5D=3.00 ALIGN=MIDDLE  ALT=\"Y%5B2%5D=3.00\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=%28Y%5B2%5D-Y%5B1%5D%29%2F%28X%5B2%5D-X%5B1%5D%29=%283.00-1.60%29%2F%2813-6%29=1.4%2F7=0.2%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "so using the first pair (6,1.6)\r<BR>\n" );
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document.write( "we'll write:\r<BR>\n" );
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document.write( "Y-1.6=0.2(X-6)\r<BR>\n" );
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document.write( "so a 25 minute call will cost...\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Y=1.60%2B.2%2825-6%29=1.60%2B.2%2A19=5.4 ALIGN=MIDDLE  ALT=\"Y=1.60%2B.2%2825-6%29=1.60%2B.2%2A19=5.4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "$5.40<BR>\n" );
document.write( " </SPAN>\n" );
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