Question

Which value of p makes the midpoint of E(3p, 8) and F(9, 4p) fall on the y-axis?
-5
-3
2
3
i got 2 am i right?..

Answer 1

on the y axis x = 0
so
3p + 9=0
p=-3

Answer 2

THANK YOu (:

Answer 3

To find the midpoint of (x1,y1), (x2,y2) take the average of the coordinates...

So, M=( (x1+x2)/2, (y1+y2)/2 )

Since you want it to fall on the y-axis, you want the x value of the midpoint to be 0.

Substitute x1=3p and x2=9 into (x1+x2)/2=0 and solve for p.