Question

between the points (-2,7) and (-7,-5) find:
a)the distance - sqrt(169)
b)the midpoint - (-9/2,1)
PS: i wanted to know if these are the correct answers

Answer 1

A) OK

Answer 2

The x difference is 5, the y difference is 12. So the diagonal distance is
sqrt(12^2 + 5^2) = sqrt(144+25) = sqrt(169)

Answer 3

For midpoint, since the x difference is 5, divide that by 2 (giving 2.5) and add that to the lower value.
So the x value of the midpoint is
-7 + 2.5 = -4.5 = -(9/2)

The y difference is 12. Half of that is 6. Add that to the lower y value, which is -5.
So the y value of the midpoint is
-5+6 = 1

Looks like you got it. Good work.

Answer 4

B) Although here's what I found for be (-4.5;1)

Answer 5

You should notice that 13 times 13 is 169

Answer 6

Ah true. Which just means your part A answer can be simplified further.

Answer 7

ohhhh thank you guys!!! :)

Answer 8

Let two points\[A(x_a;y_a) \]\[B(x_b;y_b) \]Thus the midpoint is:
\[(\frac{x_a-x_b}{2};\frac{y_a-y_b}{2})\]

Answer 9

so its A)13 and B) is (-9/2,1)

Answer 10

For me b) is (-4.5;1)

Answer 11

let me check

Answer 12

its saying its wrong

Answer 13

Hmm... weird because the formula is right. Check here: http://en.wikipedia.org/wiki/Midpoint

Answer 14

its right thanks :))

Answer 15

i typed it in wrong

Answer 16

You owe me a beer :)

Answer 17

sorry

Answer 18

np

Answer 19

Haha I hate online submission of answers. It never works well.

Answer 20

yea i know right

Answer 21

me 2

Answer 22

Never did an online submission. Is it for your school? Just curious.

Answer 23

yea

Answer 24

Wow that's cool and easy. Here, it's only on paper :/

Answer 25

oh yea ... well right now im doing it for summer school and its an online thing ... but we usually do it on paper too

Answer 26

OK, because otherwise it's too easy. Well good luck then.

Answer 27

alright thank you :)