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Use the echelon method to solve the following system of two equations in two unknowns Check your answer 7x+y = - 4 3x - 9y

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Use the echelon method to solve the following system of two equations in two unknowns Check your answer 7x+y = - 4 3x - 9y = -66 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The solution is (Type an ordered pair) OB. There are infinitely many solutions. The solution is OC. There is no solution ly), where y is any real number

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