which number is on the number line are 3 times as far from 13 as they are from 5???

a)1 only

b)11 only

c)1 and 7

d)11 and 17

this question i dont understand really well

Results 1 to 3 of 3

- Apr 2nd 2009, 10:01 PM #1

- Joined
- Mar 2009
- Posts
- 34

- Apr 2nd 2009, 10:15 PM #2
when dealing with distance on the number line, "absolute values" is one of the first things that should come to mind.

here we want to find all x such that

|x - 13| = 3|x - 5|

that is, the distance from x to 13 is 3 times the distance from x to 5

just solve this equation for x now

- Apr 3rd 2009, 03:41 PM #3

- Joined
- Mar 2007
- Posts
- 1,240