Slt, je dois résoudre le système d'équations en utilisant la méthode par substitution.

1) 3x - y = 5
x + y = 3

2) 2x + 3y = -1
x + 5y = 3

3) 3x + y = 16
8x - 5y = 12

Merciii de bien vouloir m'aider.
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