Given 2x + y + z = 3 and 5x + 3y + z = 10, what is the value of x + y - z?
Choices:
A) 3	B) 4	C) 5	D) 6	E) 7
(1) 5x + 3y + z = 10   If 2x + y + z = 3, then (2) 4x + 2y + 2z = 6   Let's subtract equation (2) for equation (1).   x + y - z = 4   The answer is 4.
<result>B</result>
Given 2x + y + z = 3 and 5x + 3y + z = 10, what is the value of x + y - z?