Question

in reperul cartezianxOy se considera punctele A (1,3) si B (-1,1). Determinati ecuatia dreptei in AB.

Answer 1

AB: x-xA/xB-xA=y-yA/yB-yA
AB: x-1/-1-1=y-3/1-3
AB: x-1/-2=y-3/-2
Numitorul fiind acelasi, obtinem:
AB: x-1=y-3
AB: x-y-1+3=0
AB: x-y+2=0