Résoudre le système suivant: 2x - 3y = 4 x + 4y = 13

bonjour

2 x - 3y = 4
x + 4 y = 13

2 x - 3 y = 4
- 2 x - 8 y = - 26

- 11 y = - 22
y = 22/11 = 2

x + 8 = 13
x = 13 - 8
x = 5

2x - 3y = 4
x + 4y = 13
x = 13 - 4y

2 (13 - 4y) - 3y = 4
26 - 8y - 3y = 4
- 11y = 4 - 26
11y = 22
y = 22/12
y = 2

x + 4y = 13
x + 4 * 2 = 13
x + 8 = 13
x = 13 - 8
x = 5

Les solutions de l'équation sont : (5 ; 2)