Let X, Y and Z be points such that XZXY=ZYXY=12 If Y = (1,7), Z = (-1,-7), then what is the sum of the coordinates of X?
btw the answer is not -2
The conditions tell us that X is the midpoint of YZ, so X = (0,0). So the sum of the coordinates is 0.
not correct but thanks for trying :(
+171 
