The Student Room Group
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>

Further Maths GCSE - Co-ordinate Geometry

Stuck on a question in the Further Maths AQA textbook, can anybody help?

Here's the question:


Heres my working out so far:


Book says the answer is:

y = (3)/(4) x - (25)/(4)

I have the gradient but can't seem to find the y-intercept
(edited 9 years ago)
IMG_0037.JPG68.6KB
IMG_0036.JPG78.8KB
Question.png236.7KB
Working Out.png271.1KB
You have 3s and 4s all over the place

You are correct when you say y=34x+cy = \dfrac{3}{4} x + c

You then put in the values
x=4
y=3

That point is not relevant to the line
Reply 2
Avatar for TomLumborg
TomLumborg
OP
Original post by TenOfThem
You have 3s and 4s all over the place

You are correct when you say y=34x+cy = \dfrac{3}{4} x + c

You then put in the values
x=4
y=3

That point is not relevant to the line


The question is to find the y-intercept
Original post by TomLumborg
The question is to find the y-intercept


I know what the question is

You are trying to find the equation of the tangent

You have used the wrong point
Reply 4
Avatar for TomLumborg
TomLumborg
OP
Original post by TenOfThem
I know what the question is

You are trying to find the equation of the tangent

You have used the wrong point


Can you tell me what point to use then?
Reply 5
Avatar for TomLumborg
TomLumborg
OP
Doesn't matter, I've figured it out. I was using the gradient not Point T.

Thanks for the help.
Original post by TomLumborg
Doesn't matter, I've figured it out. I was using the gradient not Point T.

Thanks for the help.


:smile:

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you