Answer:
d = 9
Step-by-step explanation:
In this question, we are asked to calculate the value of d , given the coordinates and the slope of the line.
Mathematically, the slope of the line could be calculated using the formula
m = (y2 -y1)/(x2 - x1)
Now, let’s say (x1,y1) = (4,6)
and (x2, y2) = (d, 21)
and our n from the question is 3.
Let’s insert all these into the equation;
3 = (21-6)/(d -4)
3(d-4) = 15
3d - 12 = 15
3d = 15 + 12
3d = 27
d = 27/3
d = 9
