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Please show all steps and answer both questions Evaluate the following determinants: | - 4 - 9 7 6| |- 3 3 - 10 2

Please show all steps and answer both questions
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Evaluate the following determinants: | - 4 - 9 7 6| |- 3 3 - 10 2 - 7 0 - 6 - 2 7| Solve the following systems of equations using the method of algebraic substitution. Verify your solutions explicitly when that is possible. - 3x - 6y = 21.9 5x + 7y = - 18.2

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