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11-04-2017
Mathematics

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Solve the system of equations and choose the correct answer from the list of options. x − y = 7 y = 3x + 12

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11-04-2017

x-y=7
y=3x+12|-3x

x-y=7
-3x+y=12
---------------------,-
-2x=19
x=-19/2

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