bonjour
f(x) = 7 x - 3
f ( 0) = - 3
f ( 2) = 7 *2 - 3 = 14 - 3 = 11
f ( - 1/3 ) = 7 * - 1/3 - 3 = - 7/3 - 9/3 = - 16 /3
antécédent de - 3
7 x - 3 = - 3
7 x = - 3 + 3
7 x = 0
x = 0
antécédent de 0
7 x - 3 = 0
7 x = 3
x = 3/7
antécédent de - 1
7 x - 3 = - 1
7 x = - 1 + 3
7 x = 2
x = 2/7
f (x) = - 3 x - 8
g ( x ) = - x + 6
- 3 x - 8 = - x + 6
- 3 x + x = 6 + 8
- 2 x = 14
x = - 7
