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Sagot :

bonjour

on f ( x ) = Ax + b

on calcule ( a )

a = f(0)-f(2) / 0-2 = 2-5 / -2 = -3/-2 = 3/2

donc on a

f(x) = 3/2 + b

on calcule b

on f(0 ) = 2

donc

f(0) = 3/2*0 + b

2 = b

b = 2

f ( x ) = 3/2 x + 2

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