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24-01-2017
Mathematics

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3x + 2y = A 5x + y = B Eliminating the variable y from the system of equations results in -7x =
A) A - 2B
B) 2B - A
C) A + 2B

Respuesta :

24-01-2017

The answer is A
You would multiply the second equation by -2 to clear the 'y'.
This leaves -10x = 2B and 3x = A
When combining these we get -7x = A - 2B

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