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  3. Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Com

Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Com

游客2024-01-12  19
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.
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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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