bonjour
f ( 0) = 4 et f ( 12) = 46
( 46 - 4 ) / ( 12 - 0 ) = 42/12 = 3.5
ax = 3.5 x
f (0) = 4
0 * 3.5 + b = 4 donc b = 4
f (x) = 3.5 x + 4
f ( 12) = 12 * 3.5 + 4 = 46
