2. 外语
  3. Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given,

Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given,

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问题 Compare Quantity A and Quantity B, using additional information centered above the two quantities if such information is given, and select one of the following four answer choices:
(A)Quantity A is greater.
(B)Quantity B is greater.
(C)The two quantities are equal.
(D)The relationship cannot be determined from the information given.
A symbol that appears more than once in a question has the same meaning throughout the question.
选项
答案A
解析 The line in the xy-plane passes through the origin and the point with coordinates(6, 6), so the equation of the line is y = x. Since the point with coordinates(c, d)is above the line, it follows that d > c, and since the point with coordinates(w, z)is below the line, it follows that w > z. From the fact that d > c and w > z, you get w + d> c + z; that is, Quantity A is greater than Quantity B. Thus the correct answer is Choice A.
This explanation uses the following strategy.
Strategy 8: Search for a Mathematical Relationship
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