Question

Aratati ca punctele urmatoare sunt coliniare :
a)A(1,1),B(1,3),C(1,-3)
b)A(1,1),B(-1,0),C(3,2)
c)A(1,3),B(-3,-1),C(3,5)

Answer 1

a) pt ca punctele sa fie coliniare det $\left[\begin{array}{ccc}1&1&1\\1&3&1\\1&-3&1\end{array}\right] =0$
daca det nu e 0 punctele nu sunt coliniare
b) det din $\left[\begin{array}{ccc}1&1&1\\-1&0&1\\3&2&1\end{array}\right] =0$
c) det din $\left[\begin{array}{ccc}1&3&1\\-3&-1&1\\3&5&1\end{array}\right] =0$

Answer 2

Sper ca ai inteles si ca te-am ajutat