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Sagot :

MATHEO74

il faut passer les x ou t ou a ou y  d'un coté et les nombres de l'autre

a = 7x - 6 = 4 - 3x

a = -7x + 3x = 4 + 6

a = -4x = 10

a = x = -4/10 = -2 /5

b = 12 - a = 18 - 3a

b = 12-18 = a - 3a

b = -6 = -2a

b = -2a/-6 = a =  1/3

13x + 11 = 8 x + 28

13 x - 8 x = 28 - 11

21 x = 17

x = 17/21

- t - 4 = 8 + 7 t

-t -7t =8 + 4

-8 t = 12

t =  - 12/8 = -3/2

5x = 0  x = 0

7y + 22 = 14 - 4 y

7 y +4 y = 14 - 22

11 y = - 8

y = -8/11

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