geometry

B is the midpoint of AC. A has coordinates (-3,4), and B has coordinates (-1 1/2,1). Find the coordinates of C.

Did i get the right answer?
(2)-1 1/2=(2)-3+x(over 2)
-3-3=3+x-3
-6=x

(2)1=(2)4+y(over 2)
2-4=4+y-4
-2=y

The coordinates of C are (-6,-2)

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  1. (-3+x)/2 = -3/2
    -3+x = -3
    x = 0
    Think about it. Starting at -3, x grows by 3/2 to -3/2 at B. It grows by another 3/2 to be 0 at C.

    (4+y)/2 = 1
    4+y = 2
    y = -2

    Had you plotted these points, you would have seen that your C point was way off.

    And what's with the "over"? This is math -- use math symbols!

    Your carelessness with parentheses easily leads to wrong answers.

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