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19 Using the substitution method the solution to the linear system x 2y 3 and...

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19 Using the substitution method the solution to the linear system x 2y 3 and y x 4 is a 1 3 b 5 1 c 1 1 d 11 4 20 Using the elimination method the solution to the linear system 4x 3y 9 and 4r 9y 21 is a 2 2 b 3 1 21 What is the product 8x 101 9x 11 72r 178r 110 b 72x 178x110 c 3 2 d 1 3 72x 2r 110 d 72x 2x 110

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