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Sagot :

Réponse:

(-2;1)

Explications étape par étape:

[AC]=y-YA=(YC-YA)/(XC-XA).(X-XA)

=y+1=4/3.(X+2)

=y=4/3X+11/3

[BD]=Y-YB=(YD-YB)/(XD-XB).(X-XB)

=Y-1=0

Y=1

intersection quand y=Y

4/3x+11/3=1

4/3x=-8/3

x=-2

verif:

y(-2)=-8/3+11/3=1

Y(-2)=1

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