Exercice 1:
1) a = (7 - 11)/ (4 - 2) = -4/2 = -2
2)on a: h(4) = - 2 × 4 + b = 7
Donc: b = 7 + 8 = 15
3) h(x) = - 2 x + 15
Exercice 2:
On a : a= (-3 - 8)/ (7 + 15)
= -11/22 = - 1/2
On a: j(-3)= 3/2 + b = 7
Donc: b = 7 - 3/2 = 11/2
Alors: j(x) = - 1/2 x + 11/2
2) j(5) = - 5/2 + 11/2 = 6/2 = 3
Exercice 3:
1) g(x) = ax + b
g(0) = b = - 9
2) on a: g(-2) = - 2a - 9 = 5
Donc: a est une solution de
-2a - 9=5
3) on a: a = (5+9)/-2 = - 7
Donc: g(x) = - 7x - 9
Exercice 4:
1) h(0) = b = - 7
On a: h(3) = 3a - 7 = -52
Donc: a = (-52 + 7)/3 = -55/3
