math,algebra II
posted by alma20 .
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
16x16y4z=8
add to equation three
4x +y +4z = 12 or
20x15y=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.
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