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Matrices

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What is true if two matrices, A and B, have the same dimensions?   Their sum A+B is the matrix in which each element is the sum of the corresponding elements in A and B.  
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What is the definition of matrix multipulcation?   Suppose A is an m x n matrix and B is an n x p matrix. then the product (AB) is the m x p matrix whose element in row i and column j is the product of row i of A and column j of B.  
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If two lines with slopes m1 and m2 are perpindicular, then what does m1m2 equal?   -1  
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What transformation maps (x,y) onto (x+h,y+k)?   This is a translation of h units horizontally and k units vertically.  
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What is true for a line under translation?   It is parallel to its image.  
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What is a reflection?   A transformation that maps a figure to its reflection image.  
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What is a transformation?   A one-to-one correspondence between the points of a preimage and the points of an image.  
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