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2x +5y = 24 l≤x≤3
Column A Column B
x y
A.if the quantity in Column A is greater
B.if the quantity in Column B is greater
C.if the two quantity are equal
D.if the relationship cannot be determined from the information given

A.if
B.if
C.if
D.if

【参考答案】

B
解析:本题的正确为(B)。因为2x+5y=24是一条直线方程,因此考生可以用边界条件法进行求解,所谓边界条件法,就是只取x区间的两端判断y的区间:z=1时,y=5.4;x=3时,y=3.6,由此可以得出:3.6≤y≤5.4
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