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标题: [求助]GWD-21-12 [打印本页]

作者: 菲菲 时间: 2006-6-21 21:13 标题: [求助]GWD-21-12

Q12:

If x + y + z = 0, x + 2y + 3z = 0, and y ≠ 0, then x/y=

A. -1/2

B.-1/3

C.-1/6

D.1/2

E. 1/3

How come the answer is A?

作者: luoye1 时间: 2006-6-22 06:42

eq 2 - eq 1 => y + 2z = 0 => z = -0.5y, plug that back into eq 1

x + y - 0.5y = 0 => x = -0.5y => x/y = -0.5

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