math,algebra II

posted by .

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
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.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra II

    The question reads: Use synthetic division to find P(2) for P(x) = x^4 - 8x^3 - 8x^2 - 10x - 2 I have no idea how to do this problem. Could someone give me a step by step explanation or link me to somewhere I can find out how?
  2. Algebra help

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

    I need to know how to solve quadratic equations by factoring. Can you so a step by step explanation to this sample problem?
  4. math

    I need help with this problem. If someone can do it step by step that would be great. I can't get the problem correct?
  5. Math need by 9pm cst

    Solve by elimination method. Please show step by step process. 7r-4s=-7 4r+7s=61
  6. Math need by 9pm cst

    Solve by substitution method. Show step by step process. 4x+5y=27 x=26-4y
  7. College algebra

    I need a step by step explaination of the example in my book. Find the domain of f(x)=(7x)/(x-8)
  8. 061689 bussines accounting and you

    All i need detail how to do it i watch video but im not understanding if anybody have more specific explanation details Please help step by step what i need to do im so confused Thank you :)))
  9. Math 221

    9w-w^3 I need someone to explain step by step how do I factor this problem
  10. Math

    I need help solving the problem not the answer. (Multiple Choice) The steps below show the incomplete solution to find the value of x for the equation 7x + 8 − 3x = −6 + 10: Step 1: 7x + 8 − 3x = −6 + 10 Step 2: 7x + 8 − …

More Similar Questions