geometry

Y is a the midpoint of XZ. For each pair of points given, find the coordinates of the third point.
(Im not sure how to work this out, any help would be grateful)
X(5,5), Z(-1,5)

Y(_____,_____)

Z(2,8), Y(-2,2)

X(_____,_____)

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  1. Y = ((5-1)/2,(5+5)/2) = (2,5)

    (-2,2) = ((X1+2)/2,(X2+8)/2)
    So, X = (-6,-4)

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