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f ( - 1 )  = 5 et f ( 2 ) = 4

( 4 - 5 ) / ( 2 + 1 ) = - 1 /3

ax =  -  x /3

f ( - 1 ) = 5

- 1 * - 1/3 + b =  5

1/3 + b = 5

b  = 5 - 1/3 =   15/3 - 1 /3 = 14/ 3

f (x) =  -   x /3 + 1 4/3

d'où   f ( 2) =   -  2*1/3 + 14/3 =   12 /3 = 4  

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