Résoudre chacune des systeme
3x+5y=-14
6x-7y= 40
6x+10y= -28
6x - 7y= 40
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-17 y = 68
y = - 68/17
y= - 4
6x - 7y= 40
6x-7(-4)=40
6x +28 = 40
6x = 40-28
6x=12
x=12/6
x= 2 S={ ( 2 ; 4 ) }
3x+4y=6
5x-12y= -46
9x +12y= 18
5x - 12y= -46
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14x = -28
x= -28/14
x= -2
5x-12y= -46
5(-2) - 12y = -46
-10 -12y = -46
-12y = -46+10
y = -36/-12
y = 3 S= { ( -2 ; 3 ) }