If two lines have slopes m
, respectively, are they perpendicular?
I have an issue in OE when explaining the statement 2. From OE shown below one can still answer the question that whether m & n are perpendicular.
I think in OE there should be two examples. First an example of two lines y= x+10
, here you can see that the lines are parallel as the product of their slope is -1
. In second example we can quote y=10x
. Now its make more sense that statement 2 is insufficient.
Statement (2) by itself is insufficient. We only know that the lines have reciprocal slopes. For example line y=10x
, are mirror reflections of each other on the x axis, but not perpendicular.
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