Asked by Bern

Need help on how to solve system of equations 2x - y + z = -7, x - 3y + 4z = -19, and -x + 4y - 3z = 18.
Answered by Reiny
add the 2nd and 3rd:
y + z = -1 ... #4

Twice the 3rd added to the first:
7y -5z = 29 .... #5

5 times #4 ---> 5y+5z = -5
#5 ---------> 7y - 5z = 29
add them:
12y = 24
y = 2

in #4
2 + z = -1
z = -3

in #1
2x - 2 - 3 = -7
x = -1

x=-1, y=2 , z=-3
Answered by Bern
We're did you get the 7y-5z=29
Answered by Bern
And we're did you get the 4 and 5
Answered by Anonymous
Not one of these answer help at all
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