# Need a Win 7 graphing calculator that can do

#### shortylickens

##### No Lifer
x^2 + y^2 = 0

All the ones I've played with this week get uppity when I try to type that in or wont even let me type it in (they have a y= box and you can only type in the x part).

#### Fardringle

##### Diamond Member
Are you sure you need to create a graph of x^2 + y^2 = 0? It's not a very exciting graph...

If you really do need to do it for some reason, solve that equation for y and you get y=&#8730;(-x^2), then put that into the y= function of the graphing calculator. I tried that with several different graphing calculators online and while a few rejected it because the square root of a negative number isn't a real number, most gave the correct answer of a single point at (0,0).

Of the calculators I found, I like this one the best because it will let you overlay multiple different formulas on the same x-y axis (a useful feature at times).

edit: It doesn't appear to have advanced algebra functions like sine/cosine/tangent/etc, so you'll need a different tool if you need those, but it graphs the formula that you requested just fine...

edit again: If you go here then click the "Free online graphing calculator" link, it has a version of the same tool that includes sin/cos/tan/abs/e/ln/log/deg/rad functions.

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#### Mr. Pedantic

##### Diamond Member
I recommend GraphCalc. It can't do what you want, (though if you put it into parametric form it'll do that fine) but it'll do pretty much everything else.

Also, you realize that x^2+y^2=0 has just one real point, right? At (0,0)?

#### Fayd

##### Diamond Member
x^2 + y^2 = 0

All the ones I've played with this week get uppity when I try to type that in or wont even let me type it in (they have a y= box and you can only type in the x part).

a circle with radius 0?

#### Mr. Pedantic

##### Diamond Member
Microsoft Mathematics 4.0
Has a 2D/3D grapher and lots of other stuff.
Oh, hey! That does what you want.

#### Gooberlx2

##### Lifer
Here's what wolfram alpha gives you.

#### shortylickens

##### No Lifer
Sorry I meant x2 plus y2 = 25 or something similar.

But thanks for the suggestions.

Like so?