Question

Find the value of k if the coordinates of the points a(2-2) b(-4 2) c(-7 k) are collinear

Answer 1

Answer:

x1=2,x2=-4,x3=-7

y1=-2,y2=2,y3=k

Step-by-step explanation :

ar of triangle = 1/2(x1(y2-y3)+x2(y3-y1)+x3(y1-y2))

0=1/2(2(2-k)+(-4)(k+2)+(-7)(-2-2))

0=1/2(4-2k-4k-8+28)

0=1/2(-6k+24)

0=-3k+12

3k=12

k=12/3

k=4

Step-by-step explanation: