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Yes. The slope, or rate, is constant. The rate being represented is speed. If the slope is a negative constant, the object is losing distance (going towards) from the orgin at at a constant speed.
The graph is a straight line. Its slope is the speed.
Yes. Speed is the rate at which distance changes over time. In calculus terms v = dx/dt, or the slope of the distance vs. time graph. If the slope of the distance vs. time graph is a straight line, the speed is constant.
It is 1 unit of distance per 1 unit of time.
Because a slope of zero indicates that the y-value (speed) isn't changing.