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OpenStudy (anonymous):
Is this a function?
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OpenStudy (anonymous):
It only touches once right, so it is a function?
OpenStudy (michele_laino):
If I draw a parallel line with respect to the x-axis, how many intersection there are with your graph? |dw:1428217288336:dw|
OpenStudy (kainui):
Yeah, if you take a vertical line it only touches once at any place so it's a function! That means that for every value of x you pick f(x) only has one possible value it can go to.
OpenStudy (michele_laino):
here are the intersections: |dw:1428221460057:dw|
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