Help….I need to see how these problems are broke down to the answer?

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1.) Solve the system by substitution. x + y = 12 y = 2x 2.) Solve the system by substitution. 5x – 2y = 3 y = 4x + 3 3.) Solve the system by substitution. x – 5y = 6 2x + 3y = 12 4.) Solve the system by substitution. 3x + 5y = 2 2x + 5y = –2

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