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Sagot :

Réponse :

Explications étape par étape

Bonsoir

3x + 4y = 5 (multiplier par 2)

6x + 2y = 1

6x + 8y = 10

6x + 2y = 1

On soustrait :

6x - 6x + 8y - 2y = 10 - 1

6y = 9

y = 9/6

y = 3/2

3x + 4y = 5

3x = 5 - 4y

x = (5 - 4y)/3

x = (5 - 4 * 3/2)/3

x = (5 - 6)/3

x = -1/3

S = {-1/3 ; 3/2}

4x + 5y = 0

2x + 3y = 8 (multiplier par 2)

4x + 5y = 0

4x + 6y = 16

On soustrait :

4x - 4x + 6y - 5y = 16 - 0

y = 16

4x + 5y = 0

4x = -5y

x = -5/4 * y

x = -5/4 * 16

x = -20

S = {-20 ; 16}

On ne voit pas la fin

x - 5y = 2 (Multiplier par 2)

-2x + 10y = -4

2x - 10y = 4

-2x + 10y = -4

On ajoute :

2x - 2x - 10y + 10y = 4 - 4

0 = 0

Infinité de solution

y = 5x - 2

y = 3x - 4

5x - 2 = 3x - 4

5x - 3x = -4 + 2

2x = -2

x = -2/2

x = -1

y = 5 * (-1) - 2

y = -5 - 2

y = -7

S = {-1 ; -7}

On ne voit pas la fin

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