2) 5x+4y+21=0
tirons x
5x=-4y-2
x=-4y-2/5
dans 1
5(-4y-2) /5 +4y+21
-20y-10/5 +4y+21
-4y-2+4y+21
0y
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2) 5x+4y+21=0
tirons x
5x=-4y-2
x=-4y-2/5
dans 1
5(-4y-2) /5 +4y+21
-20y-10/5 +4y+21
-4y-2+4y+21
0y