-2y + 5 = 3 (2y - 7) 7t + 3 = 4 (-5t + 2) Merci à l’avance !

-2y + 5 = 3 (2y - 7)

-2y+5=6y-21

-2y-6y=-21-5

-8y=-26

-8y/-8=-26/-8

Y=13/4

Y=3,25

7t + 3 = 4 (-5t + 2)

7t+3=-20t+8

7t+20t=8-3

27t=5

27t/27=5/27

T=5/27

Réponse :

bonsoir,

-2y + 5 = 3 (2y - 7)

-2y + 5 = 6y - 21

-2y - 6y = -21 - 5

-8y = -26

y = -26/-8

y = 13/4

7t + 3 = 4 (-5t + 2)

7t + 3 = -20t + 8

7t + 20t = 8-3

27t = 5

t = 5/27

voila :)