单选题
If 2x + 5y = 8 and 3x = 2y, what is the value of 2x + y?
A、
4
B、
70/19
C、
64/19
D、
56/19
E、
40/19
【正确答案】
D
【答案解析】
From 3x = 2y, it follows that y = 3x/2, so 8 = 2x + 5(3x/2)=19x/2. Then x = 16/19, 2x = 32/19, and y =24/19.Thus 2x + y =56/19 . The correct answer is D.
提交答案
关闭