Sagot :
bjr
a) -x+4=4. x-y= -x-6 je ne comprends pas
b)x+4=3. pas de y ?
x-y=7
-y = 7 - x
y = x - 7
2x+y=1
y = 1 - 2x
5x+2y=2
2y = 2 - 5x
y = 1 - 5/2x
Bonjour,
-x+4=4 <=> 0y=-1x+0 <=> x=0
x-y=-x-6 <=> y=2x+6
x+4=3 <=> 0y=1x+1 <=> x=-1
x-y=7 <=> y=x-7
2x+y=1 <=> y=-2x+1
5x+2y=2 <=> 2y=-5x+2 <=> y=-5x/2+1