C1W2 - Quiz 2 - i am stuck on solving system of equation


Kindly see the image below and see if i’m on the right track…

i have been trying to solve the system of equation however the answers i get are not in the answers option list.

(on C1W2 - Quiz 2 - The rank of matrix, question 5)

Dear @Oarabile_Chawilani,

In last equation of step 3.
dividing 20/7 by 9/4 does not equal to 4/1.
please check.

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