Question

if (1,k),(2,1),and(-2,5)are collinear then k is​

Answer 1

Answer:

K=2

Explanation:

2,1 then 1,2

Answer 2

Answer:-

If points are collinear then,

1/2[x1(y2 -y3) + x2(y3 - y1) + x3(y1 - y2)] = 0

1/2[1(1 - 5) + 2(5 - k) - 2(k - 1)] = 0

k = 2

we can also find "k" by using the slope of line,

(1 - k)/(2 - 1) = (5 - 1)/(-2 - 2)

k = 2