bonjour
f (x) = 2.5 x - 1
f (0) = - 1
f (2) = 2.5 * 2 - 1 = 5 - 1 = 4
2.5 x - 1 = 3
2.5 x = 3 + 1
2.5 x = 4
x = 1.6
g(x) = - 0.5 x + 2
- 0.5 x + 2 = 0
- 0.5 x = - 2
x = 4
2.5 x - 1 = - 0.5 x + 2
2.5 x + 0.5 x = 2 + 1
3 x = 3
x = 1
