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Linear Systemsmedium
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Given the augmented matrix in row echelon form:

[A∣b]=(123∣5014∣2000∣0)[A|b] = \begin{pmatrix} 1 & 2 & 3 & | & 5 \\ 0 & 1 & 4 & | & 2 \\ 0 & 0 & 0 & | & 0 \end{pmatrix}[A∣b]=​100​210​340​∣∣∣​520​​

Which of the following statements about this system of linear equations is true?