document.write( "Question 387847: Write the slope-intercept equation for the line that passes through (1, -9) and (3, -1). \n" ); document.write( "

Algebra.Com's Answer #274174 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "Using the point-slope formula, 
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document.write( "  (1, -9) and (3, -1). 
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document.write( " m = -1 -(-9)  / 3-1  = 8/2 = 4
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document.write( " m = 4
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document.write( "Using the standard slope-intercept form for an equation of a line y = mx + b  where m is the slope and b the y-intercept.  
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document.write( " y = 4x + b using ordered pair pt(3,-1) to solve for b
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document.write( " -1 = 4*3 + b
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document.write( " -13 = b
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document.write( " y = 4x - 13
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