Question 975867
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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