Let X, Y and Z be points such that xz/yz=zy/xy=1/2. If xy=(1,7), z=(-2,-3) then what is the sum of the coordinates of X?
+1694 xz/yz=zy/xy=1/2 Incorrect!!! 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1/ XZ/XY = YZ/XY = 1/2 Correct!!! X(-5, -13)
2/ XZ/YZ = XY/YZ = 1/2 Correct!!! X(-1/2, 2)
3/ XY/XZ = YZ/XZ = 1/2 Correct!!! X(4, 17)
All three above cases are correct but, as you can see, the coordinates of X are not the same!
You need to pick one. 
