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Sagot :
-x - 7y = 9
-x + 9y = -23
=====
-7y - 9y = 9 - (-23)
-16y = 32
y = -2
===
-x -7*(-2) = 9
-x + 14 = 9
-x = 9 - 14
-x = -6
x = 6
(6 ; -2)
-x + 9y = -23
=====
-7y - 9y = 9 - (-23)
-16y = 32
y = -2
===
-x -7*(-2) = 9
-x + 14 = 9
-x = 9 - 14
-x = -6
x = 6
(6 ; -2)
-x-7y=9
-x+9y=-23
---------------------- -
-7y-9y=9+23
-16y=32
y=-2
-x-7(-2)=9
-x+14=9
-x=-5
x=-5/-1
x=5
[-2 , 5]
-x+9y=-23
---------------------- -
-7y-9y=9+23
-16y=32
y=-2
-x-7(-2)=9
-x+14=9
-x=-5
x=-5/-1
x=5
[-2 , 5]
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