Réponse :
bonjour
f (x) = - 3 x + 7
f (8) = - 24 + 7 = - 17
f (0) = 7
- 3 x + 7 = 2
- 3 x = 2 - 7 = - 5
x = 5/3
- 3 x + 7 = 10
- 3 x = 10- 7 = 3
x = - 1
- 3 x + 7 = 0
- 3 x = - 7
x = 7/3
- 3 x + 7 = 8
- 3 x = 8 - 7
- 3 x = 1
x = - 1/3
- 3 x + 7 = 16
- 3 x = 16 - 7
- 3 x = 9
x = - 9/3 = - 3
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