Question

how do i find a missing coordinate?

Answer 1

Depends on what you are given.

Answer 2

it says If R(2,5) is the midpoint of ST and the coordinates of T are (-1,8) find the coordinate of S @timo86m

Answer 3

http://www.purplemath.com/modules/midpoint.htm
does this help?

Answer 4

Im sorry. its probably in there, but i just dont understand which one should be used. @timo86m

Answer 5

ok so it is
(x1+x2)/2 , (y1+y2)/2
^ coordinant x of midpoint
^ y coordinate of mid point
except you know the midpoint coordinates. SO you must solve for the endpoint.

(x1+x2)/2= xm xm for x-midpoint
2*xm=x1+x2 and 2*ym=y1+y2

Answer 6

your mid point is
2,5
and an end point is
-1,8
---
lets do x first
2*xm=x1+x2
2*(2)=x1+(-1) -> 4=x1-1 -> x1=5 so now you have 5,y can you find y
^ that is mid point
^ here is end point x which is -1. You could have also plugged it into x1.

Answer 7

oh gosh. i dong under stand ㅠ.ㅠ @timo86m

Answer 8

2*xm-x1=x2 and 2*ym-y1=y2
Just use the formula

xm,ym is mid point 2,5
x1,y1 is -1,8 just plug in :)

Answer 9

ohh okay lemme try @timo86m

Answer 10

what would x2 be? @timo86m

Answer 11

x2 is the x cooridate of your answer

x2,y2 which is point S

:D

Answer 12

so would it be 5? @timo86m thats what i got

Answer 13

x2 is 5 :)

Answer 14

yay okayy now i got 5,2 am i right? @timo86m

Answer 15

YES :))

Answer 16

THANK YOU@ @timo86m

Answer 17

thank you for medal. Fan me if you dont mind :)

Answer 18

haha you dont have to fan me:P i just use this site for help ^^ @timo86m

Answer 19

I want to cuzz you are a good listener :)

Answer 20

okay haha thanks @timo86m