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Sagot :

bonjour,

Dans chaque donner 3 couples solutions de l’équation donnée :

Il te suffit de remplacer x par une valeur et de déterminer y, ainsi tu obtiendras un couple solution.

Pour chaque équation on va prendre,

x = -1 ; x = 0 ; x = 1

2x - 3y = 4

2x - 4 = 3y

y = (2x - 4)/3

y = (2 * (-1) - 4)/3 = (-2 - 4)/3 = -6/3 = -2

y = (2 * 0 - 4)/3 = -4/3

y = (2 * 1 - 4)/3 = (2 - 4)/3 = -2/3

S = (-1 ; -2) ; (0 ; -4/3) ; (1 ; -2/3)

x - 5y = -3

x + 3 = 5y

y = (x + 3)/5

y = (-1 + 3)/5 = 2/5

y = (0 + 3)/5 = 3/5

y = (1 + 3)/5 = 4/5

S = (-1 ; 2/5) ; (0 ; 3/5) ; (1 ; 4/5)

-3x + 7y = 1

7y = 3x + 1

y = (3x + 1)/7

y = (3 * (-1) + 1)/7 = (-3 + 1)/7 = -2/7

y = (3 * 0 + 1)/7 = 1/7

y = (3 * 1 + 1)/7 = (3 + 1)/7 = 4/7

S = (-1 ; -2/7) ; (0 ; 1/7) ; (1 ; 4/7)

x/2 - y/6 = 1

y/6 = x/2 - 1

y = 6(x/2 - 1)

y = 6(-1/2 - 1) = -3 - 6 = -9

y = 6(0/2 - 1) = -6

y = 6(1/2 - 1) = 3 - 6 = -3

S = (-1 ; -9) ; (0 ; -6) ; (1 ; -3)

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