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bonjour

g ( - 2 ) = - 2 et  g( 3 ) = 4

( 4 + 2 ) / ( 3 + 2) = 6 /5  donc ax = 6 x /5

g ( - 2) = - 2

- 2 * 6/5 + b = - 2

- 12/5 + b = - 2

b = - 10/5 + 12/5 = 2 /5

g (x) = 6 x /5 + 2 /5

g ( 3 ) = 3 * 6/5 + 2/5 = 18/5 + 2/5 = 20 /5 =  4