You are Here: Home >< Maths

# Simultaneous equations help? :S

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Hi, I'm having trouble with this set of simultaneous equations for some reason and I just can't get the right answer

((I don't know where the pi symbol is so please take p as being pi)

This was the original question:

The diagram shows the net of a cylindrical container of radius r cm and height h cm. The full width of the metal sheet from which the container is made is 100cm, and the shaded area is waste. The s.a. of the container is 1400p cm^2.

i) write down a pair of simultaneous equations for r and h.
ii) find the volume of the container, giving your answers in terms of pi.

So for the simultaneous equations I got h+4r=100, and 2prh + 2pr^2 = 1400p

But after I got these, whatever I've tried just isn't giving a reasonable answer.
2. Also, this is in the C1 section so I'm assuming I can't use a calculator
3. WAIT NEVER MIND I GOT IT.

The answers in the back were obviously referring to the final volume whereas I was comparing the values I got for r and h
4. I can try and help but I don't see the question for this problem...

Posted from TSR Mobile

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 11, 2016
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:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams