lheiannie07 wrote:If 7x - y = 23 and 7y - x = 31, then x + y =
(A) 4
(B) 6
(C) 7
(D) 8
(E) 9
Adding together the two equations, we get:
(7x-y) + (7y-x) = 23 + 31
6x + 6y = 54
x+y = 9.
The correct answer is
E.
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