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If 2x+y = 11, 2y+z = 12 And Z+2x = 8, Find The Value Of 2x + 3y +4z?

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2x+y=11
multiply by 2
4x+2y=22
z+2y=12
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4x-z=10
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z+2x=8
multiply by 2
4x+2z=16
4x-z=10
------
-3z=-6
z=2
x=3
y=5
so,,,
2x+3y+4z=29

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