Tuesday

July 29, 2014

July 29, 2014

Posted by **alma20** on Friday, June 1, 2007 at 9:53am.

Use the echeclon method to solve the system of three equations in three unknowns

2x+4y+z = 22

4x - 4y -z = 2

4x +y =4z = 12

Matrix would be the prefered method, echelon is harder.

First, take eq1)

2x+4y+z = 22 add this to equation 2 to eliminate z

2x+4y+z = 22

4x - 4y -z = 2

6x=24 solve for x.

Now multipy equation 2) by 4

16x-16y-4z=8

add to equation three

4x +y +4z = 12 or

20x-15y=20 you know x, so solve for y.

Put x,y in any of the equations, solve for z.

This was NOT a good problem for echelon.

**Related Questions**

Algebra help - f(x)=x^3-4x^2-x+4 How do I find the x-intercept for this? This is...

math - I need help with this problem. If someone can do it step by step that ...

College algebra - I need a step by step explaination of the example in my book. ...

math - x(6x+1)<15 can some one explain the problem and answer to me step by ...

math - can someone explain step by step to solve system equations and example ...

algebra - In finding distance problems i understand the use of formula of d/rt ...

Math - Hello, I need help to understand step by step of my math problem. I am ...

Chemistry - Hi! I need help with the step by step procedure for chemical ...

Precalculus - This is for solving exponential/logarithmic functions: (This is a ...

english! - Make sure you understand the topic(s) is a step in the research ...