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2√x-1 + 4√y+6 =12
3√x-1 - 4√y+6 = -2
2√x-1 + 4√y+6 =12 +
5√x-1 = 10
√x-1 = 2
x-1 = 4
x = 5
√x-1 + 2√y+6 = 6
√5-1 + 2√y+6 = 6
2 + 2√y+6 = 6
2√y+6 = 4
√y+6 = 2
y+6 = 4
y = -2
(x,y) = (5,-2) -> B