bonjour

f ( 0) = 1  et  f ( 2) = 2

( 2 - 1 ) / ( 2 - 0) = 1 /2  donc ax  = x / 2

f ( 0) = 1

0 * 1/2 + b = 1  donc  b =  1

f (x) =  x / 2 + 1

g (x) = - 3 x+ 2  

tu calcules  2  images

g ( 0) = 2

g (  1 ) = - 3 + 2 = - 1

h (x) = x / 4

h ( 0) = 0

h ( 4) = 4/1 = 1

k ( 1) = 1 et  k ( - 3) = 4

( 4 - 1 ) / ( - 3 - 1 ) = - 3/4  donc  ax  = - 3 x  /4

k ( 1) = 1

1 * - 3 /4 + b = 1

- 3 /4 + b = 1

b =  1 + 3 /4 =  7/4

k (x) =  - 3 x /4 + 7 /4

m (0.5) = - 2  et  m ( 3.5) = 4

( 4 + 2 ) / ( 3.5- 0.5 ) = 6 / 3 = 2  donc ax  = 2 x

m ( 0.5) = - 2

0.5 * 2 + b = - 2

b = - 2 - 1 = - 3

m (x) =  2 x - 3