SOLUTION: Write the slope-intercept equation for the line that passes through (1, -9) and (3, -1).

Question 387847: Write the slope-intercept equation for the line that passes through (1, -9) and (3, -1).
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

Using the point-slope formula, 

  (1, -9) and (3, -1). 

 m = -1 -(-9)  / 3-1  = 8/2 = 4

 m = 4

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.  

 y = 4x + b using ordered pair pt(3,-1) to solve for b

 -1 = 4*3 + b

 -13 = b

 y = 4x - 13



 

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