Sagot :

Fabrice
[tex]x+y=2\\ x + y -x = 2 - x \\ y = 2 - x\\ \\ \frac{x}{y} = -\frac{4}{5} \\ \frac{x}{2-x} = -\frac{4}{5} \\ x = -\frac{4(2-x)}{5} \\ 5x = -8 + 4x \\ 5x - 4x = -8 \\ x = -8 \\ y = 2 + 8 \\ y = 10 [/tex]

En espérant t'avoir aidé.