To prove that the distance formula for the number line is a special case of the distance formula for the cartesian plane.
Given:
The distance formula.
Calculation:
Recall that distance between the points
While in the number line, the distance between two points can be obtained by the absolute value of the difference between the points.
In the cartesian plane, if the points are along a horizontal line, then the distance between the points is given by the distance of the x -coordinates of the points as well.
So, the distance formula for the number line can be consider as the distance between any two points that lie on a horizontal line in cartesian plane.
Thus, the distance formula for the number line is a special case of the distance formula for the cartesian plane.
Chapter P Solutions
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