
Hi all, I'm struggling quite a lot with this problem. I can find the null space of a matrix, but I don't know where to start with finding the matrix that transforms the object on the left to the object on the right. From what I think, the unit cube (in R3) was mapped to the x-y plane (in R3) as z=0 for all the coordinates of the parallelogram.
The transformation matrix that maps/projects objects to the x-y plane is:

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