Mathematics, 03.02.2021 01:00, hdbvhf

I'm so sorry for asking about this, I know I know how to solve this, but my mind keeps pulling a blank, please help! Solve the following system of equations algebraically: y = -x - 3 2x - y = 6

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I'm so sorry for asking about this, I know I know how to solve this, but my mind keeps pulling a bla...