Matrix A and B are given below:A =1 −3 4 −1 9−2 6 −6 −1 −10−3 9 −6 −6 −33 −9 4 9 0 and B =1 −3 0 5 −70 0 2 −3 80 0 0 0 50 0 0 0 0Assume that the matrix A is row equivalent to B. Find(a) (3 pts) rank A.
Question
Matrix A and B are given below:A =1 −3 4 −1 9−2 6 −6 −1 −10−3 9 −6 −6 −33 −9 4 9 0 and B =1 −3 0 5 −70 0 2 −3 80 0 0 0 50 0 0 0 0Assume that the matrix A is row equivalent to B. Find(a) (3 pts) rank A.
Solution
The rank of a matrix is the maximum number of linearly independent rows or columns in the matrix. Since matrix A is row equivalent to matrix B, they have the same rank.
Looking at matrix B, we can see that there are 3 non-zero rows. Therefore, the rank of matrix A (and also matrix B) is 3.
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