Răspuns :

Cristinatibulcaid
[tex] \frac{x-xA}{xB-xA} = \frac{y-yA}{yB-yA} [/tex]

[tex] \frac{x-1}{-1-1} = \frac{y-3}{1-3} [/tex]

x-1/-2=y-3/-2
x-1=y-3
y=x+2
AB=x-xA supra xB-xA = y-yA supra yB-yA   - asta e formula 

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