Réponse :
1) f(-2) = -10
f(x) = ax f(-2) = 5*(-2) = -10 f(x) = 5x
2) f(0) = 4
f(x) = ax+b f(0) = ax+b=4 ax+b=4 b= 4-0 f(0) = 0 + 4 - 0= 4 f(0) =4=4
f(-3) = -5 f(-3) = ax+b=-5 ax+b=-5 b = -5 -(-3)a = -5+3a
3a=5 a=5/3
3) f(8) = -3/5 f(8) = a*8 = -3/5 f(x) = -3/40
4) f(-1) = 5 f(-1) = -1a + b = 5 -a =5-b a = -5+b
b = 5 + a = 5 - 5 + a = a
f(5) = -2/3 f(5) = 5a + b = -2/3 b = -2/3 - 5a
5a + (-2/3) - 5a = -2/3
Explications étape par étape :
