The value of d from the points of the line whose slope is given would be = -7.
How to calculate the value of d from the given as slope?
To calculate the value of d the following steps should be taken as follows:
Slope = change in y/ change in X.
The given points (X,y ) = (3, -9) and (d, -10)
X1 = 3
X2 = d
y1 = -9
y2 = -10
Slope = 10
Therefore,
10 =3-(d)/-9-(-10)
10 = 3-d/1
10- 3 = -d
d= -7