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dydy97270
@dydy97270
January 2021
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Bonjour, j'ai un exercice à faire pour demain:
Gilbert se fait livrer 4 chaises et Claire 9. Frais fixes de livraison inclus, Gilbert paie 90€ et Claire 165€.
2) Donner f(4) et f(9)
3) Déterminer l'expression de f.
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Bonjour,
2) f(4) = 90
f(9) = 165
3) f s'exprime sous la forme ax + b avec a le d'une chaise et b les frais de livraisons.
a = [ f(4) - f(9) ] ÷ [ 4-9 ]
a = ( 90 - 165 ) ÷ ( -5 )
a = ( -75 ) ÷ ( -5 )
a = 15
f ( x ) = 15x + b
f(4) = 90
15 × 4 + b = 90
60 + b = 90
b = 30
f(x) = 15x + 30
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Verified answer
Bonjour,2) f(4) = 90
f(9) = 165
3) f s'exprime sous la forme ax + b avec a le d'une chaise et b les frais de livraisons.
a = [ f(4) - f(9) ] ÷ [ 4-9 ]
a = ( 90 - 165 ) ÷ ( -5 )
a = ( -75 ) ÷ ( -5 )
a = 15
f ( x ) = 15x + b
f(4) = 90
15 × 4 + b = 90
60 + b = 90
b = 30
f(x) = 15x + 30