Question

Determinati ecuatia dreptei care trece prin punctele A (4, -3) ; B ( 3, -4) in reperul cartezian xOy.

Answer 1

AB: x-xA/xB-xA=y-yA/yB-yA
AB: x-4/3-4=y+3/-4+3
AB: x-4/-1=y+3/-1
AB: -(x-4)=-(y+3)
AB: -x+4=-y-3
AB: -x+4+y+3=0
AB: -x+y+7=0
Inmultind cu -1:
AB: x-y-7=0