# ruler postulate problem on coordinates of line

• Aug 5th 2012, 08:33 AM
rcs
ruler postulate problem on coordinates of line
B, C, and E are three points on a line such that B - E - C. The coordinate of E is - 7 and the coordinate of C is greater than that of coordinated of B. if BC = 19 and CE = 8, find the coordinates of B and C. (use algebraic method)

BE + EC = BC
BE + 8 = 19
BE = 19 - 8 = 11

Solve: for coordinate B.

|B - E| = 11
|B - (-17) | = 11
- (B - (-7)) = 11
B + 7 = - 11
B = - 11 - 7
B = - 18....

i am in finding coordinate of C. because | C - E | = 8 then C - (-7) = 8 and C + 7 = 8 will C = 8 - 7 = 1... is this correct sir?

thanks
• Aug 5th 2012, 09:48 AM
skeeter
Re: ruler postulate problem on coordinates of line
draw a number line sketch to check your solutions ...
• Aug 6th 2012, 07:20 AM
rcs
Re: ruler postulate problem on coordinates of line
i guess it is
• Aug 6th 2012, 07:48 AM
skeeter
Re: ruler postulate problem on coordinates of line
Quote:

Originally Posted by rcs
i guess it is

What do you mean "i guess" ??? Either you've confirmed the solution or you have not, there is no "guess" to it.

Start taking ownership of your own math work ... that means checking your own answers before asking someone else to do it for you.
• Aug 6th 2012, 08:36 AM
rcs
Re: ruler postulate problem on coordinates of line
i mean i got it right. thank you.