bonjour
f (x) = 7 .2 x
linéaire de forme ax
g (x) = 30 + 5 x
de la forme ax + b = affine
f (x ) = - 0.5 x
f ( -2) = - 2 * - 0.5 = 1
- 0.5 x = 4
x = - 8
g (x) = 3 x - 5
g ( 1) = 3 - 5 = - 2
3 x - 5 = 4
3 x = 4 + 5
3 x = 9
x = 3
le reste est de la lecture graphique
