document.write( "Question 69840: Write the equation of the line passing through (3, –7) and (–6, –7). \n" ); document.write( "
Algebra.Com's Answer #49757 by Edwin McCravy(20056)\"\" \"About 
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document.write( "Write the equation of the line passing through \r\n" );
document.write( "(3, –7) and (–6, –7). \r\n" );
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document.write( "Use the slope formula:\r\n" );
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document.write( "     y2 - y1\r\n" );
document.write( "m = —————————\r\n" );
document.write( "     x2 - x1\r\n" );
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document.write( "where (x1, y1) = (3, -7) and (x2, y2) = (-6, -7)\r\n" );
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document.write( "     (-7) - (-7)     -7 + 7      0\r\n" );
document.write( "m = ————————————— = ———————— = ———— = 0\r\n" );
document.write( "      (-6) - (3)     -6 - 3     -9 \r\n" );
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document.write( "Now substitute in the point slope formula:\r\n" );
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document.write( "   y - y1 = m(x - x1)\r\n" );
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document.write( "   y - (-7) = (0)( x - (-6) )\r\n" );
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document.write( "      y + 7 = 0\r\n" );
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document.write( "          y = -7\r\n" );
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document.write( "which is a horizontal line 7 units below\r\n" );
document.write( "and parallel to the x-axis.\r\n" );
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document.write( "You could have just plotted the points and\r\n" );
document.write( "drawn a line through them,\r\n" );
document.write( "\"+graph%28+350%2C+350%2C+-7%2C+4%2C+-9%2C+4%2C+-7%29\" \r\n" );
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document.write( "and observed that every point on the line \r\n" );
document.write( "has the y-value -7, and just immediately \r\n" );
document.write( "written that y always = -7, or y = -7.\r\n" );
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document.write( "Edwin
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