Explanation:
2x + 3y = 18
2x - 3y = -6
_________ +
4x = 12
x = 12/4
x = 3
2(3) + 3y = 18
6 + 3y = 18
3y = 18 - 6
3y = 12
y = 12/3
y = 4
Solution → (x,y) = (3,4)
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