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 ;)
