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If x + y - z = 5 and x - y + z = 10, which of the following statements MUST be true?
I. y > z
II. X > 5
III. Y > 5
A. I only.
B. II only.
C. I and II only.
D. III only.
Adding the equations gives 2x = 15 or x = 7.5. So, x > 5 (II is true). Substituting x = 7.5 gives z - y = 2.5. So, z > y (I is false). There are no further conditions on y. So, III is not necessarily true.
 
 
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PillBill
PillBill
1465 Points
Been a pharmacist for about three years now.
 
 
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Added: 8/11/2008
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