m**********e
发帖数: 1045 | 1 arrow notation of reflection : y=-2
(x,y)----> (x, ?)
1) ? equals
2) Is any general way for such reflection? | f*******w
发帖数: 1243 | | r******l
发帖数: 10760 | 3 1) ?=-4-y
2）for y=a, ?=2*a-y | m**********e
发帖数: 1045 | 4 Thanks, it is the same answer with me. But the math teacher in middle school
mentioned the wrong , so I came here for verification.
Already e-mailed to the teacher addressing this concern.
【在 r******l 的大作中提到】
: 1) ?=-4-y
: 2）for y=a, ?=2*a-y
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