Question

The centroid of a triangle with two vertices (3,4) (-1,-9) is (2,-4) then 3rd vertex is

Answer 1

(x1+x2+x3)/3=2

3-1+x3=6

x3=6-2

x3=4

(y1+y2+y3)/3= -4

4-9+y3= -12

y3= -12+5

y3= -7

Third vertex is (4,-7)