Does anyone know of a free software that has a linear equation solver?

I use mathcad at work and it has a great linear equation solver that can solve a linear equation with variables... Unfortunately, I don't have the means to purchase mathcad for my home use. My ti89 will do it also but it's a bit cumbersome and I keep it at work too.

Any ideas?

I knew the answer would be

But I do not know how the step-by-step process.

The integrating factor is something like, based from what I know is:

But how do I evaluate the last or is it the final asnwer. Or am I totally incorrect at the first place or is the given a First Oder Linear Differential Equation?

Thank you~!

Hello!

Could I ask you a big favor?
I need help .
I have :
2x + [24-2 (y)] = 20
I tried to use Equation Solver here:
http://www.numberempire.com/equation...var=y&answers=

And I've got: y = x+2
It's the right answer, textbook shows me the same.
But I want to understand the way to solve it.
Please give me step by step explanation.

Thanks in advance!

hello
im now stuck on a two loop mesh that I have to solve with simultaneous equations.
I get one correct current which I think is I1 = 0.857ma
then I get lost at current two which I get 0.476ma, instead of 0.856ma

equation 1 is 4v 6kX + 4kY
equation 2 is 2v 4kX + 5kY
equation 3 is 8v 12kX + 8kY
equation 4 is 6v 12kX + 15kY
4-3 gives -2v 12-12=0 15-8= 7kY

i had make 2 equation out for nodal analysis
eq 1 : (V1-V3)/12 + V1/5 = (V3-V2)/8 + 6
eq 2 : V1 - V2 = 12

but i had no idea for equation 3, any1 help pls.

for mesh analysis, i need to comfirm the supermesh equation
by apply supermesh, 6A is open circuit.
i obtained the below equation:
-12 + 5I2 + 8(I1+I3) = 5Vx

below 2 loop are I1 and I2 with anticlockwise, I3 is upper loop with cloc

its a questionn asking for donor concentration in an Si sample.

it used the equation pho(resistiviy) = 1/sigma(conducitivity) = ( n(concentration) * e ( charge) * u ( mobility) )^-1

where does this equation derive from? i cannot find it anywhere...

I have a simple spreadsheet, with one row of equations to get sums or differences. What I'm trying to do is enter an equation so that if only one part of the end equation is present, the field is left blank, but if two or more parts of the equation are present, the field is filled in with the end result of the equation.

Right now this is what the equations look like.

When using the equation editor in Microsoft Word 2013, how do you enter a tab character?

I have an equation like this:

P = N/C

and want this:

P = N/c

(but as a Word equation, and with tabs, not spaces)

I've tried Ctrl-tab, but that does nothing.

I just don't understand the third equation in page:
http://www.allaboutcircuits.com/vol_1/chpt_10/3.html

First of all I3 is counter clockwise (as shown in pic) so why the equation shows as if it is clockwise???

Next I have no idea why in equation there is 150(I3+I1) & 300(I3-I2) since I3&I1 go through completely different direction.
The same thing for I2&I3 although theyre in the s