The value of y has not changed between the points (8, 4) and (8, 4) because both points are identical. When two points have the same coordinates, their values for both x and y are exactly the same. Therefore, there is no difference in the value of y.
To further explain, let’s break it down: the first point is (8, 4), where the x-coordinate is 8 and the y-coordinate is 4. The second point is also (8, 4), meaning that it has the same x and y coordinates. Since both y-values are 4, the change in the value of y is calculated as:
Change in y = y₂ – y₁
In this case, y₂ = 4 and y₁ = 4.
Change in y = 4 – 4 = 0
So, there is a change of 0 in the value of y between these two points.