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document.write( "First, calculate the slope.\r\n" );
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document.write( " The formula for the slope of a straight line passing through two given points (
,
) and (
,
) is\r\n" );
document.write( " m = 
.\r\n" );
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document.write( " Substitute the given data = 4, = -2, = 1, = 3 into the basic formula\r\n" );
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document.write( " m = 
= 
= 
.\r\n" );
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document.write( "Next, write an equation of the line having the slope and passing through the given point (4,-2).\r\n" );
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document.write( " An equation of a straight line in a coordinate plane which has the slope m and passes through the given point P = (a,b) is \r\n" );
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document.write( " y - b = m*(x-a). \r\n" );
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document.write( " Substitute here m = , a = 4, b = -2, and you will get\r\n" );
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document.write( " y - (-2) = 
, or, equivalently,\r\n" );
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document.write( " y + 4 = .\r\n" );
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document.write( " Having the equation in this form, you can convert it to any other equivalent form you want.\r\n" );
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document.write( "See the lesson\r
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document.write( " - Equation for a straight line in a coordinate plane passing through two given points\r
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document.write( "in this site.\r
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
