sdancer sdancer
  • 26-09-2017
  • Mathematics
contestada

What is the equation of the line that passes through (3,-1) and (4,7)

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chewhiuyonowuwox
chewhiuyonowuwox chewhiuyonowuwox
  • 26-09-2017
gradient = 7-(-1)/4-3
= 8
when x = 3, y = -1,
y = 8x + c
-1 = 8(3) + c
c = -1 - 24
= -25
the equation of the line is y = 8x - 25.
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trash22
trash22 trash22
  • 26-09-2017
Using y=mx+b the answer would be y=8(x-3)-1.
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