Determine whether the system of linear equations has one and only one solution,

in /by

Determine whether the system of linear equations has one and only one solution,

1.  X + 3Y=9

    3X-Y=7

2.  2X-5Y=10

     4X-10Y=20

INDICATE WHETHER THE MATRIX IS IN LOW-REDUCED FORM:

1.  1 0 -12

     0 1    2

     00      0

2.   1 0 0   -1

       0 1 0   -2

       0 0 2    -3

3.  1 0 0   9

      0 1 0    6

     0 0 0      2

     0 0 1      8

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