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Question 613737: i need to find the equation of the line that passes through each pai of points and write the answer in standard form
(-2,-4), (1,-1)
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! i need to find the equation of the line that passes through each pai of points and write the answer in standard form
(-2,-4), (1,-1)
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Find the slope, m
m = diffy/diffx = (-4 + 1)/(-2 -1) = -3/-3 = 1
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Use y = mx + b and either point to find b
-1 = 1*1 + b
b = -2
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y = x - 2
x - y = 2
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Using determinants:
|+x +y 1|
|-2 -4 1| = 0
|+1 -1 1|
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x*(-4+1) - y*(-2-1) + 1*(2+4) = 0
-3x + 3y = -6
x - y = 2
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