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**numquester****Member**- Registered: 2016-12-12
- Posts: 9

I'm relearning algebra after some years of being away from school, and I'm learning to use Geogrebra. At the moment I'm plotting some lines to get a sense of what elementary functions look like on a grid. I never really got a good sense of this when I was in school.

So I have:

f(x) = x , which gives a diaganol line.

f(x) = -x , which gives a mirror of the above diagonal line (Is there a math term for this?).

f(x) = 0x , which gives a horizontal line.

How would I plot a vertical line? The closest that I have found is:

f(x) = 10^(100)x

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,765

Hi;

Welcome to the forum. x = 5 or x = -3 or x = 100 all plot vertical lines.

f(x) = 10^(100)x does not plot a vertical line, it is an illusion of scale.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**numquester****Member**- Registered: 2016-12-12
- Posts: 9

Thanks.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,765

Hi;

Good to see you getting back into math and smart to use some modern tools like Geogebra to assist you.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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