Bonjour je ne comprend pas cet exercice . Aidez moi svp ! C'est pour Demain ! Merci de vos futures réponses

1)
x
3x
3x+2

f(x) = 3x+2

2
f(-5) = 3*-5+2 = -15+2 = -13
f-2) = 3*-2+2 = -6+2 = -4
f(0) = 2
f(3,5) = 3*3,5+2 = 10,5+2 = 12,5
f(7) = 3*7+2 = 21+2 = 23

3
f(-3) = 3*-3+2 = -9+2 = -7
f(-1) = 3*-1+2 = -3+2 = -1
f(2) = 3*2+2 = 6+2 = 8
f(5) = 3*5+2 = 15+2 = 17
f(13) = 3*13+2 = 39+2 = 41

4)
3x+2 = 6
3x = 6-2
x = 4/3

3x+2 = 8
3x = 8-2
3x = 6
x = 6/3
x = 2    antécédent 2