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If [img]2011q3/ct_egmatqm_egmatqchoose_0468_201121[/img] and xy=4, then 7y+2x=[i
If [img]2011q3/ct_egmatqm_egmatqchoose_0468_201121[/img] and xy=4, then 7y+2x=[i
游客
2024-01-14
43
管理
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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