document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=273898>Question 273898</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help solving this for my 9th grade son\r<BR>\n" );
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document.write( "Find the line of best fit between the following points:<BR>\n" );
document.write( "(1,5) and (3,8)\r<BR>\n" );
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document.write( "a) 1.5<BR>\n" );
document.write( "b) 3.5<BR>\n" );
document.write( "(his answers)\r<BR>\n" );
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document.write( "line:  ____?_____\r<BR>\n" );
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document.write( "His answer 1.5 and 3.5 came from calculator instructions, he needs the step by step instructions for solving (without a calculator).\r<BR>\n" );
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document.write( "Any help is greatly appreciated. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #200012 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=200012\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the a) answer is the slope and the b) answer is the y-intercept\r<BR>\n" );
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document.write( "find the slope first<BR>\n" );
document.write( "___ the difference in the y-coordinates, divided by, the difference in the x-coordinates (rise over run)<BR>\n" );
document.write( "___ make sure you take the difference in the same direction for both coordinates\r<BR>\n" );
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document.write( "in this case the slope (m) equals ___ (8 - 5) / (3 - 1) = 3/2 = 1.5\r<BR>\n" );
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document.write( "using the slope-intercept form of the line (y = mx + b), substitute one of the points to find the y-intercept (b)\r<BR>\n" );
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document.write( "5 = (1.5)1 + b ___ 3.5 = b\r<BR>\n" );
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document.write( "so the line (in slope-intercept form) is ___ y = (1.5)x + 3.5\r<BR>\n" );
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document.write( "yes, the calculator does work </SPAN>\n" );
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