anonymous
  • anonymous
how do i find a missing coordinate?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Depends on what you are given.
anonymous
  • anonymous
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
anonymous
  • anonymous
http://www.purplemath.com/modules/midpoint.htm does this help?

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anonymous
  • anonymous
Im sorry. its probably in there, but i just dont understand which one should be used. @timo86m
anonymous
  • anonymous
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
anonymous
  • anonymous
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.
anonymous
  • anonymous
oh gosh. i dong under stand ㅠ.ㅠ @timo86m
anonymous
  • anonymous
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 :)
anonymous
  • anonymous
ohh okay lemme try @timo86m
anonymous
  • anonymous
what would x2 be? @timo86m
anonymous
  • anonymous
x2 is the x cooridate of your answer x2,y2 which is point S :D
anonymous
  • anonymous
so would it be 5? @timo86m thats what i got
anonymous
  • anonymous
x2 is 5 :)
anonymous
  • anonymous
yay okayy now i got 5,2 am i right? @timo86m
anonymous
  • anonymous
YES :))
anonymous
  • anonymous
THANK YOU@ @timo86m
anonymous
  • anonymous
thank you for medal. Fan me if you dont mind :)
anonymous
  • anonymous
haha you dont have to fan me:P i just use this site for help ^^ @timo86m
anonymous
  • anonymous
I want to cuzz you are a good listener :)
anonymous
  • anonymous
okay haha thanks @timo86m

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