) Trans form A into echelon madrix using elementary row row operations. * Fractions should not used. -5 -3 -1 -6 -7 -3 - 2 ー4 -5 A = -2 - 2 -3 8. -6 - 4 -12 -13 Suppose S is 'a linear system in X,, X2, X3, X4 with the augmented matrix A above. i) List the leading variables S. i) Solve and find solution set of S. there for which. How many solutions of S are 2. t X4 Xí t Xz + X3 2. 141? %3D

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