You are Here: Home >< A-levels

# c4 parameshits watch

1. need help the markscheme doesnt help

The curve C has parametric equations

x=1/(t+1)
y=1/(1-t)

show that C satisfies the cartesian equation y = x/(2x-1)
2. you may need to edit the thread title
3. Rearrange the first equation to find a value of t in terms of x and then plug that in to the t in the y equation.
4. Rearrange the equation with x to make t the subject then sub it into the second equation.
5. (Original post by HateOCR)
Rearrange the equation with x to make t the subject then sub it into the second equation.
a did mate, here let me show you

x=1/(1+t)
t=(1/x) -1

sub t into y

y= 1/(1-1/x)

which i get as -x/1 = -x
6. I got
(Original post by awijdijwajiodji)
a did mate, here let me show you

x=1/(1 t)
t=(1/x) -1

sub t into y

y= 1/(1-1/x)

which i get as -x/1 = -x
I got y=1/(2-1/x)
You can factorise 2x-1 so you get
Y=1/1/x(2x-1)
1/1/x is the same as x so
Y=x/(2x-1)

You didnt sub it back in correctly
7. Here sorry for the scrunched up paper i threw it after i solved it lol
8. (Original post by HateOCR)
Here sorry for the scrunched up paper i threw it after i solved it lol
on the 6th line idk why you took out 2x-1 how do you know how to do that?
9. (Original post by awijdijwajiodji)
on the 6th line idk why you took out 2x-1 how do you know how to do that?
Because the question says it was 2x-1 in the denominator. Also if you try expanding the bracket you will see you end up with 2-1/x therefore it works.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 2, 2018
Today on TSR

### Top unis in Clearing

Tons of places at all these high-ranking unis

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets