Given 2x + y + z = 3 and 5x + 3y + z = 14, what is the value of x + y - z? Choose the most appropriate option.
A) 11 B) 12 C) 13 D) 14 E) 15
(1) 5x + 3y + z = 14   If 2x + y + z = 3, then (2) 4x + 2y + 2z = 6   Let's subtract equation (2) for equation (1).   x + y - z = 8   The answer is 14.
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Given 2x + y + z = 3 and 5x + 3y + z = 14, what is the value of x + y - z?