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1) x+y+z=9
-2x+y+2z=3
x-4y-z=2

2) 2x-4y=-4
3x-y=4

3) -3x+2y+5z=-10
-x-2y+3z=6
2x-y-z=4

4) 2x+3y-z=9
-2x-y+2z=2
x+y-2z=3

5) y=7-x
x+3y=7

Sagot :

Answer:

1. x = 4 y = -1 z = 6

2. x = 2 y = 2

3. x = -1/5 y = -19/5 z = -3/5

4. x = -5 y = 6 z = - 1

5. x = 7 y = 0

Step-by-step explanation:

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