March 28, 2015

Homework Help: math,algebra II

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

I need someone to explain to me step by step the process of this problem its in my book as an example but i am not understanding it. Ive researched the explanation of the ECHELON METHOD...BUt i am not seeingit...this is the problem that they have:

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
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.

Answer this Question

First Name:
School Subject:

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 ...
Algebra 2 - I need to know how to solve quadratic equations by factoring. Can ...
Math 221 - 9w-w^3 I need someone to explain step by step how do I factor this ...
College algebra - I need a step by step explaination of the example in my book. ...
061689 bussines accounting and you - All i need detail how to do it i watch ...
math - x(6x+1)<15 can some one explain the problem and answer to me step by ...
Algebra II - The question reads: Use synthetic division to find P(2) for P(x) = ...
algebra - In finding distance problems i understand the use of formula of d/rt ...
math - can someone explain step by step to solve system equations and example ...