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Please advise what is the next step ? Question 4. Solve the system of equations using matrices. Use Gaussian elimination method with back - substitution

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Please advise what is the next step ?

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Question 4. Solve the system of equations using matrices. Use Gaussian elimination method with back - substitution 4x - 4 4+52 - -4y = 4 -4 5 - 44 5x 45 \ + 2 - 16 = 5 +5 0 - 16 X - 44 - 21 1 - 4 0 - 21 4 - 4 5 - 44 Perform 5 + 5 + 0 - 16 - 4 + 8 - 21

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