Question

-x+3y-z=1
2y+3=2
5z=10

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Answer 1

2y= 2- 3
2y= -1
y = -1/2
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5z=10
z=2
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-x + 3 . (-1/2) - 2 = 1
-x -3/2 - 2 = 1
x = -3/2 -2 -1
x = -9/2 = -4,5

Answer 2

5z=10
z=10/2
z=2

-x+3y-z=1
Substituindo o valor de z
-x+3y-2=1
-x+3y=1+2
-x+3y=3
-x=3-3y ×(-1)
x=-3+3y

2y+3=2
2y=2-3
2y=-1
y=-1/2

x=-3+3.(-1/2)
x=-3+(-3/2)
x=-6-3/2
x=-9/2

Valores:
x=-9/2
y=-1/2
z=2