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2 points. However, the farther apart the 2 points the striaghter the line will be, unless you move the straight edge!!.
A particle moving in a straight line may or may not have acceleration. Acceleration is adifferent phenomenon altogether. the rate of change of velocity is acceleration, a particle can move in a straight line with a constant velocity thus having no acceleration & it can also move with increasing or decreasing velocities thereby accelerating or deaccelerating.
inertia......
Inertia - or the absence of any force making it change direction.
A line with zero slope is a straight horizontal line which neigher climbs nor descends along the X-Axis. A line with an undefined slope is a straight vertical line that does not move left or right along the Y- Axis.