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Audreyar
@Audreyar
April 2019
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Determiner la fonction affine g telle que g(1)= -2.5 et g(-2)= 18.5
niveau 3ieme svpp
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slyz007
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Une fonction affine est de la forme g(x)=ax+b
On sait que g(1)=-2,5 donc a*1+b=-2,5 ⇔ b=-a-2,5
On sait que g(-2)=18,5 donc -a*2+b=-2a-a-2,5=18,5 ⇔ -3a=21 ⇔ a=-7
Donc b=7-2,5=4,5
g(x)=-7x+4,5
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Verified answer
Une fonction affine est de la forme g(x)=ax+bOn sait que g(1)=-2,5 donc a*1+b=-2,5 ⇔ b=-a-2,5
On sait que g(-2)=18,5 donc -a*2+b=-2a-a-2,5=18,5 ⇔ -3a=21 ⇔ a=-7
Donc b=7-2,5=4,5
g(x)=-7x+4,5