On a horizontal straight line graph of distance (vertical axis) against time, which variable is not changing?

slope is zero, so ∆y/∆x = 0

thus, y is not changing (distance, in this case)

On a horizontal straight line graph of distance against time, the variable that is not changing is time.

On a horizontal straight line graph of distance against time, the vertical axis represents the distance, and the horizontal axis represents time. To determine which variable is not changing, we need to consider the characteristics of a horizontal line.

A horizontal line indicates that there is no change in the vertical variable (distance) while the horizontal variable (time) changes. In other words, the distance remains constant while the time progresses.

Therefore, the variable that is not changing in this scenario is the distance.