Elia is solving the following system below by substitution. {3x+y=104x−3y=−12 Which of the following would be a step in solving the system? Substitute y+10 for x in 4x−3y=−12. Substitute −y+10 for x in 4x−3y=−12 Substitute −3x+10 for y in 4x−3y=−12 Substitute 3x−10 for y in 4x−3y=−12

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