Question

Find a, for which point p(a/3,2) is the mid point of the line segment joining the points q(-5,4) and r(-1,0).

Answer 1

p(a/3,2)

q(-5,4)

r(-1,0)

therefore,

X=x1+x2/2

a/3=-5-1/2

2a/3=-6

a=-6×3/2

a=-3×3

a=-9