Ta3 l3able fi bi idek l ndaf li ba3dak mghassalon
8z-7=81
8z=88
z=11
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Answer y=mx+b
Step-by-step explanation: b is the y intercept and x is the slope
The straight line joining the points A(3,-5) and B(6,k) has a gradient of 4.
Gradient is the slope
So the slope of the line joining the points A(3,-5) and B(6,k) is 4
Slope of line joining two points = 
A(3,-5) and B(6,k) are (x1,y1) and (x2,y2)
slope = 
slope = 
We know slope =4

Cross multiply and solve for k
k + 5 = 12
k = 7
The value of k = 7