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Mathematics 11 Online
OpenStudy (henryblah):

How would you define parametrically the group of all lines that go through the origin? (2 dimensions) Is it [(at,bt) : a,b belong to reals]?

OpenStudy (tkhunny):

Does it get Horizontal and Vertical?

OpenStudy (henryblah):

Probably not. I first tried (a,na) but this gets everything apart from vertical.

OpenStudy (tkhunny):

What if you pick a = 0 or b = 0?

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