SOLUTION: Find Y: X+2Y-Z=-6 3x-y+2z=17 -5X+y-3z=-26 I tried substitution but i don't know I always do one little thing wrong and can't figure it out. Please help. Thankyou

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Question 256278: Find Y:
X+2Y-Z=-6
3x-y+2z=17
-5X+y-3z=-26
I tried substitution but i don't know I always do one little thing wrong and can't figure it out.
Please help.
Thankyou
Found 2 solutions by richwmiller, scott8148:
Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website!
Are X, Y and Z in the first supposed to be the same x y and z in the other equations?
Then use all capital letters or all small letters(preferred).
X is not the same as x
x=1 y=0 z=7

Answer by scott8148(6628) (Show Source):
You can put this solution on YOUR website!
I prefer elimination (maybe it's the cathartic suggestion of violence...)

adding -3 times the 1st to the 2nd ___ -7Y + 5Z = 35 ___ A

adding 5 times the 1st to the 3rd ___ 11Y - 8Z = -56 ___ B

adding 8 times A to 5 times B ___ -Y = 0 ___ Y = 0