👤

Sagot :

VINS

bonjour

f ( 4 ) = 1 et f ( 7) =  2

( 2 - 1 ) / ( 7 - 4 ) = 1 /3

ax = x / 3

f (4) = 1  

4 * 1/3 + b = 1

4/3 + b =  1

b =  3/3 - 4/3 = - 1 /3

f (x) = x /3 - 1 /3

f ( 7) = 7 * 1/3 - 1/3 = 7/3 - 1/3 = 6/3 = 2  

NBA10

Réponse :

bonjour,

f(x) = ax + b

on calcule a :

a = (yB - yA)÷(xB - xA )

a = (2 - 1 ) ÷(7 - 4)

a = 1/3

f(x) = 1/3x + b

on calcule b :

f(7) = 2

f(7) = ax + b

1/3 ×7 + b = 2

7/3 + b = 2

b = 2 - 7/3

b = 2/1 - 7/3

b = 6/3 - 7/3

b = -1/3

donc f(x) = 1/3x -1/3

voila:)

Other Questions

© 2024 IDNLearn. All rights reserved.