the product of the slope of two 垂直的直线 should be -1, right?
needed confirm作者: 陈月麟 时间: 2003-2-22 23:48
yes, you are right.
If one slope is 2, then the slope of 垂直的直线 must be -1/2. Their product is -1. Pls tell me why answer is y = 1/5x. I think it should be -1/5x. Do u agree?
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