Question

if (k,-2) (0,1) (5,4)are collinear points then find k

Answer 1

K is equal to 7..by using the formula of area of triangle

Answer 2

using area of Δ =1/2(x1(y2-y3)+x2(y3-y1)+x3(y1-y2) ==>0
                      0 = 1/2(k(1-4)+0(4+2)+5(-2-1)
                      0 = -3k+0-15
                      k = -5