Use the Gauss-Jordan Method to Solve the System of Equations $4 x-5 y-7 z=-1$

Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last
variable be the arbitrary variable.
- $4 x-5 y-7 z=-1$
$-7 x+2 y-8 z=1$
$20 x-25 y-35 z=-5$

A) $\{(-5 z+2,4 z-25, z) \}$
B) $\{(-1,1,-5) \}$
C) $\varnothing$
D) $\{(5,5,-1) \}$

Correct Answer:

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