Réponses

2014-03-18T17:48:03+01:00
30 : f(x) = a*x + b, on cherche a et b.

a  = (11-5)/(2-0) = 6/2 = 3
b = f(0) = 5 donc f(x) = 3*x + 5

33 : a) 2        -2*2+5 = -4+5 = 1           -2*1+5 = 5-2 = 3
b) f(x) = a* x + b et on a y = a * g(y) +b donc g(y) = (y-b)/a

donc g(y) = (y-5)/(-2)

Voila !