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Which of the following functions are linear? HINT: You don't have to use the formal definition, although that's always a valid approach. X +Y X

Which of the following functions are linear? HINT: You don't have to use the formal definition, although that's always a valid approach. X +Y X -9 Of ( Ly] ) = 2X - Y O X 7XY + Z Y 3X +Y +Z 4X - 6Y + 5Z Of (X) = 3 Of (X) = 3X

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