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标题: GWD1-34 [打印本页]

作者: ytrrew 时间: 2004-11-5 19:46 标题: GWD1-34

(A)

In the xy-plane, what is the slope of line l?

(1) Line l does not intersect the line with equation y = 1 - x.

(2) Line l intersects the line with equation y = x

为什么选A

作者: mary1 时间: 2004-11-5 19:51

it doesn't intersect the line, that means it's parallel with the line, thus it's sufficient to know the slope; on the other hand, there are infinite number of lines intersect the line y = x, it's impossible to know the slope of l by only knowing the fact it intersects y = x

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