document.write( "Question 77589: Write the equation of the line, in slope-intercept form, that contains the points: (7,4) and (-8,4) \n" ); document.write( "
Algebra.Com's Answer #55657 by Edwin McCravy(20060)\"\" \"About 
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document.write( "Write the equation of the line, in slope-intercept\r\n" );
document.write( "form, that contains the points: (7,4) and (-8,4)\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) = (7, 4) and (x2, y2) = (-8, 4)\r\n" );
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document.write( "     (4) - (4)     0     \r\n" );
document.write( "m = ——————————— = ———— = 0\r\n" );
document.write( "    (-8) - (7)    -15      \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 - 4 = 0(x - 7)\r\n" );
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document.write( "   y - 4 = 0x - 0\r\n" );
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document.write( "       y = 0x + 4\r\n" );
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document.write( "It's normally written just y = 4, but with the\r\n" );
document.write( "0x in there it is in the form\r\n" );
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document.write( "      y = mx + b\r\n" );
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document.write( "where the slope is 0 and the y-intercept is the\r\n" );
document.write( "point (0, b) which is (0, 4).  The line is a horizontal\r\n" );
document.write( "line 4 units above the x-axis:\r\n" );
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document.write( "\"graph%28300%2C+300%2C+-9%2C+2%2C+-5%2C+6%2C+4%29\"\r\n" );
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document.write( "Edwin
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