Question 975867: If the gradient of (8,y1) and
(-1,3) is 2, find the value of y1
Answer by algebrahouse.com(1659)   (Show Source):
You can put this solution on YOUR website! Gradient of a straight line is the same as "slope".
y2 - y1
------- = slope
x2 - x1
Coordinates of two points are (x1,y1) and (x2,y2)
(8,y1) and (-1,3) {given points}
3 - y1
------ = 2 {slope of the line passing through the two points is 2
-1 - 8
3 - y1
------ = 2 {subtracted on bottom}
-9
3 - y1 = -18 {multiplied each side by -9}
-y1 = -21 {subtracted 3 from each side}
y1 = 21 {divided each side by -1}
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