Odpowiedź:
A = ( 2 , 4 ) , B = ( 7 , 9 )
xa = 2 , xb = 7 , ya = 4 , yb = 9
(xb - xa)(y - ya) = (yb - ya)(x - xa)
(7 - 2)(y - 4) = ( 9 - 4)(x - 2)
5(y - 4) = 5(x - 2)
5y - 20 = 5x - 10
5y = 5x - 10 + 20
5y = 5x + 10 | : 5
y = x + 2 - postać kierunkowa prostej
x - y + 2 = 0 - postać ogólna prostej
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Odpowiedź:
A = ( 2 , 4 ) , B = ( 7 , 9 )
xa = 2 , xb = 7 , ya = 4 , yb = 9
(xb - xa)(y - ya) = (yb - ya)(x - xa)
(7 - 2)(y - 4) = ( 9 - 4)(x - 2)
5(y - 4) = 5(x - 2)
5y - 20 = 5x - 10
5y = 5x - 10 + 20
5y = 5x + 10 | : 5
y = x + 2 - postać kierunkowa prostej
x - y + 2 = 0 - postać ogólna prostej