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# Thread: Coordinate geometry sucks ass...

1. ## Coordinate geometry sucks ass...

How do I do this question?  Reply With Quote

2. And this...  Reply With Quote

3. Study hard, pay attention in class, read your textbook and do the exercises. It gets easier.  Reply With Quote

4. HERES A TRY:

* mAB = 7-(-2)/2-(-4) = 3/2

therefore, mBC is -1/mAB = -2/3

* to find the length of BC, find AB using easy geometry and then multipy by 2

* since you know the slope, what i did(not the most efficient way) was make a triangle to find the x and y components of change between B and C. (Q is a scalar that you solve for)

.....|\
.....|-\
-2Q|--\ BC
.....|---\
.....+----\
.......3Q

* now that you found Q, the x-coordinate for C is Ax + 3Q
the y-coordinate is Ay -2Q

* i got results of C = (20,-5). i doubled checked my work using a formula for the line being:
y = -2/3X + (25/3)
where i solved for 25/3 as the y-intercept.

i hope this all makes sense, i am bad at explaining things. If you need this done in flash, its not hard to code  Reply With Quote

5. we have just done this in maths... if you want, i could e-mail the pages to you on how to do such a thing and some examples if you want.  Reply With Quote

6. ok, the second problem is.

P (or y-int) = (0,4)
Q (or x-int) = (10,0)

thats just simple, linear equations. then comes the tricky part. Putting thoses values on your page. Now, in vector mode, AB = 6i+ 9[B]j[B]... just to tell you that. and to confuse matters even more. thus making BC 12i + 18j (i decided to drop the bold, getting too slow to type so hand in there). Thus making CA= 18i + 27j...

Now i might be doing this wrong, but i am doing this at night...

C= (14,25)... now if you want this on a nice sheet of lined paper... just ask, it'll explain it more... and plus, I used vectors. so... yeah... are you actually doing them at the moment? because if you aint, its just another way to do things like this...  Reply With Quote

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