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2013-09-19T19:35:02+02:00
Fonction affine soit ax+b
on a f(0) = 19.9 et f(7) = 22.3
f(0) = 19.9 veut dire a(0) +b = 19.9 
f(7) = 7a + 19.9 = 22.3
on résoud
7a+19.9 = 22.3
7a = 22.3 - 19.9
7a = 2.4
a = 2.4/7 = 0.342