Bonsoir svp aidez moi resoudre ce systeme d equation
{80a+b=45
{95a+b=225
1 Voir la réponse Utilisateur Brainly Utilisateur Brainly Bonsoir

{80a+b=45
{95a+b=225

b=45-80a
95a+45-80a=225

b= 45-80a
15a+45=225

b= 45-80a
15a=225-45

b= 45-80a
15a= 180

b= 45-80a
a=180/15

b=45-80a
a= 12

b= 45-80(12)

b= 45-960
a=12

a= 12
b= -915     S= (-15 ; 12 )
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