Select all equations that can result from adding these two equations or subtracting one from the other.
x + y = 12
3x - 5y = 4
-2x - 4y - 8
-2x+6y=
4x - 4y = 16
4x + 4y - 16
2x-by-8

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so if i have 30 points and i ask a question for 5 points, then when someone asks a question i will lose 5 points and the answerer earns 5

happy to