I need help with this system of 4 x 4 system of equations:

2a-6b+4c-6d=-12
4a+6b-c+2d=25
2a+8c-6d=-12
2a+6b-3c+d=17

Is there any methods you have already tried? If you've already attempted the problem, you will probably benefit better from any help by posting any attempts you have made.

Also, is there a specific method that you are to be using? There's a few ways to solve for those variables.

I have made a few attempts and am absolutely stumped . I just somewhere to start from

Quote:

---

Originally Posted by mclovin92

i have made a few attempts and am absolutely stumped . i just somewhere to start from

---

What method of solving systems of equations are you practicing right now?

If you're using substitution, then that problem gets pretty messy. If you're supposed to use addition (adding each equation to one another), then it's a little more manageable.

This page may help with either of those: Algebra II: Systems of Equations and Inequalities - Math for Morons Like Us

The middle section deals with using addition. That is the method I would use to solve that one, unless your teacher wants you practicing substitution.

EDIT: Oh yeah, I forgot about Gaussian elimination too (http://www.purplemath.com/modules/systlin6.htm).

I am allowed to use either method

Quote:

---

Originally Posted by FadedMaster

What method of solving systems of equations are you practicing right now?

If you're using substitution, then that problem gets pretty messy. If you're supposed to use addition (adding each equation to one another), then it's a little more manageable.

This page may help with either of those: Algebra II: Systems of Equations and Inequalities - Math for Morons Like Us

The middle section deals with using addition. That is the method I would use to solve that one, unless your teacher wants you practicing substitution.

EDIT: Oh yeah, I forgot about Gaussian elimination too (Systems of Linear Equations: Gaussian Elimination).

---

I used that link but it doesn't talk about using problems w 4 equations and variables

You can also use determinents.