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Sagot :

Réponse :

f(x) = 2,5x

1. f(4) = 2,5*4 = 10

f(12) = 2,5*12 = 30

f(-1) = 2,5*(-1) = -2,5

2. On calcule f(x) = -5

2,5x = -5

x = 5/2,5 = 2

On calcule f(x) = 17,5

2,5x = 17,5

x = 17,5/2,5 = 7

On calcule f(x) = -15

2,5x = -15

x = -15/2,5 = -6

j'espère t'avoir aidé !

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