Given 2x + y + z = 3 and 5x + 3y + z = 9, what is the value of x + y - z?  Choose the correct choice from the following options.
A) 3
B) 4
C) 5
D) 6
E) 7
(1) 5x + 3y + z = 9   If 2x + y + z = 3, then (2) 4x + 2y + 2z = 6   Let's subtract equation (2) for equation (1).   x + y - z = 3   The answer is 3.
<result>A</result>
Given 2x + y + z = 3 and 5x + 3y + z = 9, what is the value of x + y - z?