## Unofficialllyy one year ago Barry is trying to calculate the distance between point E(3, 1) and point F(4, 7). Which of the following expressions will he use?

1. Unofficialllyy

My answer choices are: A. $\sqrt{(7-1)^2+(4-3)^2}$ B. $\sqrt{(7-3)^2+(4-1)^2}$ C. $\sqrt{(7-4)^2+(3-1)^2}$ D. $\sqrt{(4-7)^2+(1-3)^2}$

2. Unofficialllyy

But I did it myself and I got $\sqrt{(4-3)^2+(7-1)^2}$

3. anonymous

|dw:1432913970733:dw|

4. Unofficialllyy

I don't need to solve it.

5. Unofficialllyy

I need to find out which expression he will use to find the distance between (3,1) and (4,7)

6. Unofficialllyy

I'm pretty sure my answer is right, but it isn't one of the answer choices.

7. anonymous

Ah that depends on which you chose as X1, Y1 and X2, Y2

8. anonymous

try it in reverse. i.e. chose 4, 7 as X1, Y1, and 3,1 as X2 , Y2

9. Unofficialllyy

I did, there is no answer choice that starts with 1

10. anonymous

Your right the only options for X2 are 3 or 4, and since the distance formula starts with (x2 -x1) then none of the above qualify!

11. anonymous

except maybe d?

12. Unofficialllyy

I don't have a none of the above option though :(

13. Unofficialllyy

Yeah maybe. I'll try it. Thanks for helping!

14. anonymous

|dw:1432914891064:dw|

15. anonymous

no, no matter which point you make as X1, y1 and x2, y2, none of the above are an option

16. Unofficialllyy

Yeah so i'm confused on what to choose

17. anonymous

sometimes, textbooks get it wrong, just take down both solutions that I have given and hand to your teacher

18. Unofficialllyy

I will. Thank you!

19. anonymous

you're very welcome!

20. anonymous

There is a good lesson in this, you done everything right, and if at the end of the day, you have done things right and the answer still doesnt come out, then you have to have confidence in what you do.