bonjour,
x = A
y = B
50x+35y = 520
30x+45y = 480
on peut simplifier par 5 avant
10x+7y = 104
6x+9y = 96
par combinaison :
-6(10x+7y) = 104
+10(6x+9y) = 96
-60x-42y = -624
+60x+90y = 960
48y = 336
y = 7e
10x+7y = 104
10x+49 = 104
10x = 104-49
x = 5,5e
verification :
50x+35y = 520
50*5,5+35*7 =
275+245 = 520
30x+45y = 480
30*5,5+45*7 =
165+315 =480