Bonsoir
A
4x +5y = 8
2x +2y = 3
tu élimines les x en multipliant la 2ème équation par -2
tu as
4x + 5y = 8
-4x -4y = -6
y = 2
4x+ 5y = 8
4x +10 = 8
4x = 8-10
4x = -2
x = -2/4 = -1/2
B
2x -3y = -5
5x -6y = 8
-4x +6y = 10
x = 2
10 -6y = 8
-6y = 8-10
-6y = -2
y = 2/6 ou 1/3
