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**Matrix of linear transformation (urgent)**

**Identify the matrix of the transformation for the following:**

a) (x,y,z) = (2x-y+4z,x+y-z,x-z)

b) (x,y) = (x,2x)

c) (x,y,z) = (x-2y,3x-6y)

**Here are my attempts**

a)

2,-1, 4

1, 1,-1

1, 0,01

b)

1,0

2,0

c)

1,-2, 0

3,-6, 0

Are theses correct? Thanks in advance:)