Question

X+y+z=-6
x-y+3z=-18
2x+2y+2z=-8

Answer 1

Explanation:

hello :

the system is : x+y+z=-6.....(1)

x-y+3z=-18.....(2)

2x+2y+2z=-8.....(3)

use (3): 2(x+y+z) = - 8 so : x+y+z = -4

use (1) : x+y +z = -6 -6=-4 false

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