The co-ordinate of a point R on a line is 8. The point S is on the same line which is to the left of R and a distance of 7 units from R. Find the co-ordinate of S. If P is the midpoint of seg RS, find the co-ordinate of point P.

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Solution

The figure depicting points R, S and P is as follows:

Coordinate of R = 8
Since S is 7 units to its left, we have,
Coordinate of S = (8 $-$ 7) = 1
Also, its given that P is the midpoint of SR.
i.e. coordinates of P = $\frac{8 + 1}{2} = 4.5$

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