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can you tell me if these are right and how to solve them? My friend told me some answers and not sure how they got

can you tell me if these are right and how to solve them? My friend told me some answers and not sure how they got them and if they are right.

-x - 5y - 5z =2

4x - 5y + 4z = 19

x + 5y - z = -20

(-2, -3, 3) answer

-4x - 5y - z = 18

-2x - 5y - 2z =12

-2x + 5y + 2z = 4

(-4, 0 - 2)

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