Sagot :
Réponse:
Bonjour !
4x + 89 = -7x - 65
4x+7x = -65-89
11x = -154
x = -154/11
x = -14
18x + 489 = 43x + 65
18x - 43x = 65-489
-25x = -424
x = -424/-25
x = 16,96
Bonjour !
1)
[tex]4x + 89 = -7x - 65 \\ 11x + 89 = - 65 \\ 11x = - 154 \\ x = \frac{ - 154}{11} = - 14[/tex]
[tex]S=\{-14\}[/tex]
2)
[tex]18x + 489 = 43x + 65 \\ - 25x + 489 = 65 \\ - 25x = - 424 \\ x = \frac{ - 424}{ - 25} = \frac{424}{25} = 16.96[/tex]
[tex]S=\{\frac{424}{25}\}[/tex]
Bonne soirée