True or false True or false from each one I\'m confused If A is a 4 x 3 matrix,

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True or false

True or false from each one I'm confused

If A is a 4 x 3 matrix, then the transformation x -> Ax Ax maps R3 onto R4. Every linear transformation from Rn to Rm is a matrix transformation. The columns of the standard matrix for a linear transformation from Rn to Rm are the images of the columns of the n x n identity matrix under T. A mapping T : Rn -> Rm is one-to-one if each vector in Rn maps onto a unique vector in Rm. The standard matrix of a horizontal shear transformation from R2 to R2 has the form [a 0 0 d], where a and d are plusminus 1.

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