Réponse :
bonjour
f ( 5) = 10 et f ( 10) = 11
( 11 - 10 ) / ( 10 - 5 ) = 1/5
ax = x /5
f (5) = 10
5 * 1/5 + b = 10
5/5 + b = 10
b = 10 - 1 = 9
f (x) = x /5 + 9
f ( 10) = 10/5 + 9 = 11
f ( -7) = 4 et f ( 4) = - 7
( - 7 - 4 ) / ( 4 + 7 ) = - 11/11 = - 1
ax = - x
f ( - 7 ) = 4
- 7 * - 1 + b = 4
7 + b = 4
b = 4 - 7 = - 3
f (x ) = - x - 3
f ( 4) = - 4 - 3 = - 7
f ( -8) = 0 et f ( -1) = 13
(13 - 0 ) / ( - 1 + 8 ) = 13/ 7
ax = 13/7
f ( - 8) = 0
- 8 * 13/7 + b = 0
- 104/7 + b = 0
b = 104/7
f (x) = 13 /7 + 104/7
f ( - 1 ) = - 1 *13/7 + 104/7 = - 13/7 + 104/7 = 91/7 = 13
fais le dernier pour voir si tu as compris et donne ton résultat
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