bonjour,
f (x) = 7 x
f ( - 1 ) = - 7
f ( 3) = 21
f ( -10) = - 70
f ( - 5) = - 35
f ( 0) = 0
f ( 2) = 14
f ( 6) = 42
f ( 1.5) = 10.5
7 x = 63
x = 9
f ( -2) = - 14 donc A ∈ courbe
f (x) = 3 x / 4
f ( 0) = 0
A ( 0 ; 0 )
f ( 6 ) = 18/4 = 4.5
B ( 6 ; 4.5)
le reste est du graphique