Les solutions de ce système
1)
x-4y=1
3x+2y=3
x= 4y+1
3(4y+1)+1+2y=3
12y+3+1+2y=3
14y=-1
y=-1/14
x-4(-1/14)=1
x+4/14=1
x=1-4/14
x=14-4/14
x=10/14=5/7
2)
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x=4
Les solutions de ce système
1)
x-4y=1
3x+2y=3
x= 4y+1
3(4y+1)+1+2y=3
12y+3+1+2y=3
14y=-1
y=-1/14
x-4(-1/14)=1
x+4/14=1
x=1-4/14
x=14-4/14
x=10/14=5/7
2)