If [img]2011q3/ct_egmatqm_egmatqchoose_0468_201121[/img] and xy=4, then 7y+2x=[i

游客2024-01-14 71

问题 If

and xy=4, then 7y+2x=

选项 A、
B、
C、
D、
E、

答案 A

解析 If you multiply xy times both sides of the first equation, you get 7y+2x=7xy. You know that xy=4, so 7y+2x=7(4)=28.

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