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Someone help me out a lil
The substitution method should be used to solve which system of equations?


A. 5x – 7y = 16

2x – 7y = 12

B. 4x + 3y = –5

6x – 3y = 2

C. 2x + 6y = 3

3x + 2y = –1

D. x = 3y + 1

2x + y = 7