bonjour
f( 0) = 4
f ( 3) = - 2
( - 2 - 4) / ( 3 - 0 ) = - 6/ 3 = - 2
f (3) = - 2
- 6 + b = - 2
b = - 2 + 6
b = 4
f (x) = - 2 x + 4
f ( 0) = 0 + 4 = 4
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bonjour
f( 0) = 4
f ( 3) = - 2
( - 2 - 4) / ( 3 - 0 ) = - 6/ 3 = - 2
f (3) = - 2
- 6 + b = - 2
b = - 2 + 6
b = 4
f (x) = - 2 x + 4
f ( 0) = 0 + 4 = 4