Guang L. answered • 05/21/19

Math is always fun.

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**substitution**** Method:**

From x + 2y = 12, we get x = 12 - 2y, and take it to equation 3x - 3y = 4, we have 3(12 - 2y) - 3y = 4, which is 36 - 6y - 3y = 4, or 36 - 9y = 4, we get y = 32/9, and x = 44/9