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1 Solve the systems of linear equations using the substit y x 4 20x 30y 75 9 O 10 10 31 O 1 10 O

1 Solve the systems of linear equations using the substit y x 4 20x 30y 75 9 O 10 10 31 O 1 10 O A 31 9 31 O 10 10 10 A Ele 5 Given the formula A ab solve for a 0 O A

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