M(6, 6) is the midpoint of mc139-1.jpg. the coordinates of s are (8, 9). what are the coordinates of r?

The midpoint is just the average of the endpoint coordinates.

(6,6)=((8+x)/2, (9+y)/2)

(12,12)=((8+x), (9+y))

(4,3)=(x,y)

So the coordinates of R are (4,3)

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