# Thread: Im having a massive brain fart at the moment and Hicky and Rayne are on

1. ## Im having a massive brain fart at the moment and Hicky and Rayne are on

A right triangle is formed in the first quadrant by the x- and y-axes and a line through the point (9,5).
Write the length L of the hypotenuse as a function of x.

I have no clue how to do this at all. Help.

2. hicky is an english major

3. Originally Posted by Rayne
hicky is an english major
well obviously that's the brain fart, Rayne

4. I don't know he's a smart guy.

5. Im imagining the end formula is going to be some sort of distance formula, how I get there and eliminate the Ys is beyond me.

6. I think I have to make some sort of imaginary line, have it connect with imaginary points, and find the distance of the imaginary points in a forumula for distance...

7. i seem to remember this is pretty early trigonometry but on account of being an english major i have forcefully forgot how to maths

8. L=the square root of ((l9xl +5)/x)^2)+(l9xl+5)^2
Am i right?
x being the slope

Edited! 2ce now so its clear what i ment, i knew what i ment in my head, but wrote it wrong.

9. Its not an equilateral right triangle.

10. the length can be any number above 392

11. i hate myself right now

12. SHIT WHEN I SAY 9x +5 i mean the slope absolute valued + 5

13. Originally Posted by Kirby
Its not an equilateral right triangle.
I mean isosceles.

14. Originally Posted by ElijahWyatt
L=the square root of ((9x +5)/x)^2)+(9x+5)^2
Am i right?
x being the slope

Edited!
it wants a function of the coordinate x

15. but the slope is unknown also......
How can i have 2 variables? Why would the X value even fucking matter, and what x value?? 9, 5 is the value, what other x value is there?

Well just use my formula and extrapolate backwards, X in my formula is slope, so plug into all the x's the formula using the x value that is used to find the slope.

16. the triangle is formed by the x axis and y axis. since it's a right triangle, the y intercept and x intercept are equal and the slope of the hypotenuse is -1.

use the point slope form of the equation of a line:

(y-y1)=m(x-x1)

(y-5)=-1(x-9)

y=-x+14

17. i edited my formula had a brain fart and used the slope i derived the forumla with instead of x, now it should be right.

18. Originally Posted by Rayne
the triangle is formed by the x axis and y axis. since it's a right triangle, the y intercept and x intercept are equal and the slope of the hypotenuse is -1.

use the point slope form of the equation of a line:

(y-y1)=m(x-x1)

(y-5)=-1(x-9)

y=-x+14
not only is this wrong but it didnt even answer the question. WHAT THE FUCKING F

19. nope

20. wait what?

just because its a right traingle doesn't mean the middle piece is sloped in any specific way. The x axis leg could extend far longer than the y axis leg, meaning the slope of the line connecting the two(hypotnuse) would be really small making the line really big.

21. HOLD UP

22. fuck im retarded

24. hm im not sure immediately. i thought about constructing a function for y based on its limits but i dont think that'll work.

25. wait a second no it cant abifucwgofnqpegvfqwwd

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