j'aimerais votre aide svp se serai gentil merci​

Bonjour :)

1) f(10) = 5×10+ 13 = 50 + 13 = 63

2) f(19) = 5× 19 + 13 = 95 + 13 = 108

3) f(-3) = 5× (-3) + 13 = -15 + 13 = -2

4) a) f(x) = 100

5x + 13 = 100

b) 5x + 13 = 100

5x +13 -13 = 100 -13

5x = 87

5x ÷ 5 = 87 ÷ 5

x = 17,4

J'espère t'avoir aidé ;)