document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=62300>Question 62300</A>: <I><SPAN STYLE=\"word-break: break-all;\"> ok, i have 2 find out the formula for this table and ive tried all that i can think of, here it is.\r<BR>\n" );
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document.write( "Age (yr)                20   30   40   50   60   70<BR>\n" );
document.write( "Pulse rate (beats/min)  175  166  157  148  139  130\r<BR>\n" );
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document.write( "Write an equation in function notation for the relation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #43040 by </B><A HREF=/tutors/aboutme.mpl?userid=tutorcecilia><B>tutorcecilia(2152)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tutorcecilia><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=tutorcecilia><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=43040\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is a linear equation.  That is, as age increases, pulse rate decreases.<BR>\n" );
document.write( "Use the formula for a slope and the slope-intercept formula to solve.<BR>\n" );
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document.write( "The x's are the ages.<BR>\n" );
document.write( "The y's are the pulse rates.<BR>\n" );
document.write( "So, match-up the ages and pulse rates to form a list of coordinate pairs:<BR>\n" );
document.write( "(20, 175) <BR>\n" );
document.write( "(30, 166) <BR>\n" );
document.write( "(40, 157)<BR>\n" );
document.write( "(50, 148)<BR>\n" );
document.write( "(60, 139)<BR>\n" );
document.write( "(70, 130)<BR>\n" );
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document.write( "Slope=m=(y1-y2)/(x1-x2)[use the formula for the slope of a line]<BR>\n" );
document.write( "m=(175-166)/(20-30) [plug-in the values and solve for the slope of the line]<BR>\n" );
document.write( "m=9/-10=-9/10<BR>\n" );
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document.write( "y=mx+b [use the slope-intercept formula]<BR>\n" );
document.write( "175=(-9/10)(20)+b [plug-in the values and solve for b]<BR>\n" );
document.write( "175=118+b<BR>\n" );
document.write( "175+18=b<BR>\n" );
document.write( "193=b [plug the slope and y-intercept (b) back into the equation}<BR>\n" );
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document.write( "y=mx+b<BR>\n" );
document.write( "y=(-9/10)x+193 [the equation of the line]<BR>\n" );
document.write( "or f(x)=(-9/10)x+193 [function notation] \r<BR>\n" );
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