bonjour
f (x) = 2 x + 3
f ( 4) = 8 + 3 = 11
f ( 1) = 2 + 3 = 5
f ( - 2) = - 4 + 3 = - 1
2 x + 3 = 5
2 x = 5 - 3
2 x = 2
x = 1
A (4) = 8 + 3 = 11 donc A ( 4 ; 11 )
B = ( 1 ; 5 )
C = ( - 2 ; - 1)
