The three coordinate points are collinear. Use slopes to write aproportion to find the value of a.

Question

#38. (-4,1),(-1,2),(5,a)

#39. (4,5),(1,2),(a,0)

Answer 1

#38

(a-2)/(5+1) = (2-1)/(-1+4)
(a-2)/6 = 1/3
3a - 6 = 6
a = 4

Do #39 the same way, let me know what you got