Question: Row Operations on Matrix

I have a matrix;   

                1   -4  1

A4:           0    7  5     

                 0    0   0

When I applied; > A5:=RowOperation(A4,2,1/7) it gives me

     1        -4                  1        

     0 1.000000000    5/7         How can i eliminate decimals?

    0         0                   0

one more question, I have two linear eqautions with two unknowns that has no solution.When I try to solve it, there is no output.Isn't it supposed to be saying error or something else?Thanks for your help.

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