Paul: x
Julie : y
x+y = 20
x= 20-y
x-3 = y+1
20 -y-3 = y+1
17 -y = y+1
17 -1 = y+y
2y = 16
y = 16/2
y = 8
Julie: 8 ans Paul : 12 ans
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bonjour,
Paul: x
Julie : y
x+y = 20
x= 20-y
x-3 = y+1
20 -y-3 = y+1
17 -y = y+1
17 -1 = y+y
2y = 16
y = 16/2
y = 8
Julie: 8 ans
Paul : 12 ans