linear algebra question 4

a) 1 5 -10 4

   0 0    0 0

b) 1 0 3

    0 1 -5

    0  0  0

c) 1 0 0 2 7

    0 1 0 0 9

    0 0 0 0 0

    0 0 0 0 0

d) 1 -3 -10

    0  0    0

    0  0    0

How many free  variables in each?​

 

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