SOLUTION: find the value of the unknown the gradient of AB is 4, where A= (2,1) and B (5,y)

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Question 771878: find the value of the unknown
the gradient of AB is 4, where A= (2,1) and B (5,y)
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Using the gradient formula:
y2 - y1/x2 - x1
y - 1/5 - 2
y-1/3
y - 1/3 = 4
Cross multiply
y - 1 = 12
y = 13
Coordinates for B = (5,13)
Hope this helps.
:-)