Hello,
Let say this point we're looking for is the point O.
It lies halfway beetween X and Y, so we just have to use this formula :
If my english isn't good tell me ;)
The question is asking for the y-coordinate of the midpoint of segment XY.
Add the given y-values and divide the sum by 2.
y = (10 + 4)/2 = 14/2 = 7
The choices show: 2 7 -3 -8
Answer: second choice, 7
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