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15. Solve the system of equations using substitution or elimination: x- +4x- y =7 2x- y=-1 16. Solve the system of equations using Gaussian Elimination

15. Solve the system of equations using substitution or elimination: x- +4x- y =7 2x- y=-1 16. Solve the system of equations using Gaussian Elimination with matrices: x-21+3: =9 -x+3y=-4 2x - 5y+5: =17

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