Bonsoir,
x+y = 100
y = 100-x
y-x = 12
on remplace y par sa valeur
100-x -x = 12
100 -2x = 12
100-12 = 2x
88= 2x
x= 88/2
x= 44
y = 44+ 12 = 56
44+56 = 100
56-44 = 12
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Bonsoir,
x+y = 100
y = 100-x
y-x = 12
on remplace y par sa valeur
100-x -x = 12
100 -2x = 12
100-12 = 2x
88= 2x
x= 88/2
x= 44
y = 44+ 12 = 56
44+56 = 100
56-44 = 12