2. 外语
  3. Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

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问题 Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional information centered above the quantities if such information is given. Choose one of the following answer choices:
(A)if Quantity A is greater;
(B)if Quantity B is greater;
(C)if the two quantities are equal;
(D)if you cannot determine the relationship based on the given information.

选项 A、 
B、 
C、 
D、 
答案A
解析 The correct answer is A. To answer this question, first multiply the bottom equation by -3 to get -9x-21y=-246. Now you can add the two equations and eliminate one of the variables, as follows:
(9x-2y=16)
+(-9x-21y=-246)
- 23y=-230
y=10
Substitute 10 for y in the first equation and solve for x:
9x-2(10)= 16
9x-20=16
9x=36
x=4
Quantity A(x+y)is equivalent to 4 + 10, or 14, and Quantity B = 10; therefore, Quantity A is greater than Quantity B.
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