bonjour
k (x) = 4 x /3
k ( 9/2) = 9/2 * 4 /3 = 36/6 = 6
b ) 4 x /3 = 5
4 x = 15
x = 15/4
*****************************************************************************************
f ( 4) = 120 ⇔ f (x) = 120/4 = 30 ⇔ f (x) = 30 x
f ( - 10) = 8 ⇔ f (x) = - 8/10 = - 4 /5 ⇔ f (x) = - 4 x /5
*****************************************************************************************
f (3) = 5 ⇔ f (x) = 5 x /3