I came up with using a change of coordinate transformation matrix and scaling matrix with the point.
a = [1,1,0,1] the point 1,1
b = [1 0 0 0,0 1 0 0, 0 0 1 0, 2 2 0 1] the change of coordinate matrix
c = [2 0 0 0, 0 1 0 0, 0 0 1 0, 0 0 0 1] the scaling matrix
[a]**[c]
multiplying those gave me wrong answer
and scales But it doesn't work. What am I doing wrong?