Réponses

2014-06-03T20:28:16+02:00
5x + 3y = 8
2x - 4y = - 2

20x + 12y = 32
6x - 12y = - 6

26x = 26
x = 26/26
x = 1

2x - 4y = - 2
2(1) - 4y = - 2
2 - 4y = - 2
- 4y = - 2 - 2
- 4y = - 4
y = 4/4
y = 1

Les solutions du système sont : (1 ; 1)
On appelle cela les systèmes d'équations d'additions ^^
2014-06-03T20:29:03+02:00
Bonsoir

5x + 3y = 8
2x - 4y = -2


-10x - 6y = -16
10x - 20y = - 10

- 26y = - 26
y = 1

5x + 3 = 8
5x = 8 -3
5x = 5
x = 1

Vérification

5x +3 y = 8
5 + 3 = 8