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14-01-2017
Mathematics

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3x-4y=18 x 3y=-7 how do i solve this

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14-01-2017

3 times (2) gives 3x +9y = -21 (3)
(3) - (1) gives 13y = -39
y = -3
Sub. y=-3 into (2)
x + -9 = -7
x = 2

Answer = (2,-3)

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