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11-08-2017
Mathematics

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Solve by using elimination 3x+y=27 -3x+4y=-42

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ghanami ghanami

11-08-2017

hello :
3x+y=27 ...(1)
-3x+4y=-42 ...(2)
(1) +(2) : 5y = -15
y = -3
subsct in : (1) 3x -3 = 27
3x= 30
x=10

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