Entering Matrices

Type M={{1,3},{2,4}} in the input bar and press enter to add the matrix

. Type N={{0,-1},{1,0}} in the input bar and press enter to add the matrix

. P=M*N will find the product MN. A’=M*A will find the image of a point A under the transformation defined by matrix M. The command ApplyMatrix[M,poly1] will find the image of the polygon poly1 under the transformation defined by matrix M.