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Which one of the following equations are linear in the variables r and y? Justify your answer. (a) (cos 3)a- ey = 2020 (b)4x

Which one of the following equations are linear in the variables r and y? Justify your answer. (a) (cos 3)a- ey = 2020 (b)4x + xy = -30 (c) 7y = 14

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