The solution of the equation 2x + 3Y = 9 can be obtained according to the following conditions: (1) the value of X and the value of Y are opposite to each other; (2) the value of X is three times of Y

(1) Because X and y are opposite numbers, x = - y, so
2X + 3Y = 2x-3x = 9, then x = - 9, y = 9
(2) Because the value of X is three times that of Y, then x = 3Y, then
2X + 3Y = 9y = 9, so y = 1, x = 3

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