document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=162368>Question 162368</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Write an equation for a line that passes through the following points:<BR>\n" );
document.write( "(-7, 9), (8, 9)\r<BR>\n" );
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document.write( "I dont really know how to do this, and i would really apperciate seeing the steps that explain how to do this problem. THank you in advance! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #119675 by </B><A HREF=/tutors/aboutme.mpl?userid=gonzo><B>gonzo(654)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=gonzo><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=119675\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let (x,y) = (-7,9)<BR>\n" );
document.write( "let (x1,y1) = (8,9)<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "you need the slope intercept form of the equation for a straight line.<BR>\n" );
document.write( "that is:<BR>\n" );
document.write( "y = m*x + b<BR>\n" );
document.write( "where m is the slope and b is the y intercept.<BR>\n" );
document.write( "y intercept is the value of y when x equals 0<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "first you solve for m which is the slope.<BR>\n" );
document.write( "the formula for the slope is (y-y1)/(x-x1)<BR>\n" );
document.write( "substituting from above, you get (9-9)/(-7-8) = 0/-15 = 0.<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "right off the bat it looks like you are going to have a horizontal line since the slope is 0.<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "now that you have the slope, you need to find the y intercept.<BR>\n" );
document.write( "take one of the points and substitute it in the slope intercept form of the equation with m = 0<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "that equation is<BR>\n" );
document.write( "y = 0*x + b<BR>\n" );
document.write( "substitute x = -7 and y = 9<BR>\n" );
document.write( "you get<BR>\n" );
document.write( "9 = 0*(-7) + b<BR>\n" );
document.write( "which becomes<BR>\n" );
document.write( "b = 9.<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "your complete equation is y = 0*x + 9<BR>\n" );
document.write( "which reduces to y = 9<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "graph of that equation is a horizontal line with y = 9 for any value of x.<BR>\n" );
document.write( "graph shows up below<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28400%2C400%2C-5%2C5%2C-1%2C10%2C9%29 ALIGN=MIDDLE  ALT=\"graph%28400%2C400%2C-5%2C5%2C-1%2C10%2C9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
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