document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=683476>Question 683476</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. I have shown my work below. Am I missing any steps?\r<BR>\n" );
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document.write( "y = mx + b<BR>\n" );
document.write( "y = m(x) + 4<BR>\n" );
document.write( "(4 - -1) / (1 - -4)<BR>\n" );
document.write( "= 5 / 5<BR>\n" );
document.write( "m = 1<BR>\n" );
document.write( "y = 1x - 4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #423594 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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=423594\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Using point (-1,-4) and (1,4)<BR>\n" );
document.write( "slope is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28y1-y2%29%2F%28x1-x2%29+=+%28-4-4%29%2F%28-1-1%29+=+-8%2F-2+=+4 ALIGN=MIDDLE  ALT=\"%28y1-y2%29%2F%28x1-x2%29+=+%28-4-4%29%2F%28-1-1%29+=+-8%2F-2+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "Using (-1,-4) and slope in point-slope<BR>\n" );
document.write( "y--4 = 4(x--1)<BR>\n" );
document.write( "y+4=4(x+1)<BR>\n" );
document.write( "y+4=4x + 4<BR>\n" );
document.write( "y = 4x + 4 - 4<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28y+=+4x%29 ALIGN=MIDDLE  ALT=\"highlight_green%28y+=+4x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "confirm using the other point (1,4)<BR>\n" );
document.write( "y-4=4(x-1)<BR>\n" );
document.write( "y - 4 = 4x - 4<BR>\n" );
document.write( "y = 4x - 4 + 4<BR>\n" );
document.write( "y = 4x<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Seen graphically, red line is y=1x-4, green line is 4x<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C200%2C-10%2C10%2C-10%2C10%2Cx-4%2C4x%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C200%2C-10%2C10%2C-10%2C10%2Cx-4%2C4x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "Using y=1x-4, confirm that (-1, -4) is a solution<BR>\n" );
document.write( "y = 1(-1) - 4 = -1 - 4 = -5  <BR>\n" );
document.write( "(-1, -5) not (-1, -4)<BR>\n" );
document.write( "using (1,4)<BR>\n" );
document.write( "y = 1(1) - 4 = 1 - 4 = -3<BR>\n" );
document.write( "(1, -3) not (1, 4)<BR>\n" );
document.write( "Thus, y=1x-4 is not the correct line that passes through neither (-1,-4) nor (1,4)<BR>\n" );
document.write( ".....................<BR>\n" );
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