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Sagot :
[tex]3x+y=5\\
2x-2y=22\\\\
3x+y=5\\
\underline{x-y=11}\\
4x=16\\
x=4\\\\
4-y=11\\
-y=7\\
y=-7\\\\
\boxed{(x,y)=(4,-7)}
[/tex]
3x+y=5
2x-2y=22 ...............2(x-y)=22 ⇒ x-y=11
3x+y=5
x-y=11 (+)
3x+x+y-y=11+5
4x=16 /:4
x=4
x-y=11
4-y=11
-y=7 /*(-1)
y=-7
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