Question

PR has an endpoint at (25, -5) and a midpoint of (18, -1). What is the value of the x-coordinate of the other endpoint?

Answer 1

@anikhalder

Answer 2

Hmm...Okay..lets first draw a st. line...on the st line name the left pt P and the right pt Q and M the midpt..
@Muddingirl
tell me when you have done that

Answer 3

i did it @anikhalder

Answer 4

Now write the coord of pts:-
Q (25,-5)
M (18,-1)
P (x,y)
@Muddingirl ...tell me after you do this

Answer 5

complete @anikhalder

Answer 6

Great...
Now do you know the midpt formula...or the section formula?

Answer 7

i know the midpoint formula @anikhalder

Answer 8

Awesome...:)
pls tell me..:)

Answer 9

m=(x1+x2/2,y1+y2/2)

Answer 10

Awesome..:)
x1=x(P's x coord)
x2=25(Q's x cord)
M's x cord=18
and so M's x cord=x1+x2/2
Just place the values and solve for x1(or x)..:)
@Muddingirl

Answer 11

i get 11?

Answer 12

Excellent!
You can similarly solve for y coord of P
@Muddingirl

Answer 13

oh really that's right?

Answer 14

11+25/2=36/2=18
!
that's the x coord of the midpt!
:)
You are right!

Answer 15

oh wow, i actually solved right! I guess you were right practice makes perfect! Thanks

Answer 16

Welcome..keep practising!