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yoki2007
@yoki2007
January 2021
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bonjour pouvez vous m'aider svp !
Soit A (9;2) et B (2;9) Donner une équation de la droite (AB).
merci d'avance,
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Annflr
Y = ax + b
Tu as ici :
{2 = a*9 + b
{9 = a*2 + b
b = 2 - a*9
Tu remplaces dans l'autre équation :
9 = a*2 + 2 - a*9
9 - 2 = 2a - 9a
7 = - 7 a
- 7a = 7
a = -1
Tu calcules ensuite b :
b = 2 - a*9
b = 2 - (-1)* 9 = 2 - (-9)
b = 11
Tu as donc l'équation : y = -1 x + 11
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Tu as ici :
{2 = a*9 + b
{9 = a*2 + b
b = 2 - a*9
Tu remplaces dans l'autre équation :
9 = a*2 + 2 - a*9
9 - 2 = 2a - 9a
7 = - 7 a
- 7a = 7
a = -1
Tu calcules ensuite b :
b = 2 - a*9
b = 2 - (-1)* 9 = 2 - (-9)
b = 11
Tu as donc l'équation : y = -1 x + 11