maths question

[16v_kid]

ahah abit random but i cant figure out how to right an equation using simultaneous equation.

here is the question.

-A rectangular house has a perimeter of 40 meters and the length is 4 meters more than the width. What are the dimensions of the house?


please help, im really confused about this and i have a test on it on Tuesday.

TIA.

cheers

[GTom]

Perimeter = 40

x (length), y (width)
therefore eqn(1) = 2x +2y = 40

Length is 4 more than width
therefore eqn(2) = x = y + 4

so your 2 eqns are:
2x +2y = 40
x = y + 4

put them together and you should get y=8 and x=12

[16v_kid]

ohh thanks alot man.

now i can do it!

i got up to the 2x+2y=40, then i couldt figure out the next equation.

thanks you alot.

cheers

[whoalse]

Wow...I see math tuition here too...? lol...

[16v_kid]

oh and one more equation that's doing my head in.

- One number is 9 less than three times a second number. If the first number plus twice the second number is 16, find the two numbers.



???

[peedman]

x = 3y - 9
x + 2y = 16


x = 16 - 2y
16 - 2y = 3y - 9
5y = 25
y = 5

x + 2(5) = 16
x = 6

x = 6, y = 5

[Treza360]

oh and one more equation that's doing my head in.
- On number is 9 less than three times a second number. If the first number plus twice the second number is 16, find the two numbers.
???

- One number (x) is 9 less than three times a second number (y). If the first number (x) plus twice the second number (y) is 16, find the two numbers.

Similar deal again (assuming your first word is meant to be one):
Eqn. 1: x = 3y - 9
Eqn. 2: x + 2y = 16

Good to see you're studying.

Cheers,
Trent

[rayray086]

HAHA geeks!

[Mind's Eye]

any of you guys wanna do the hsc for me too while ya at it?

[Soundofav6]

Damn !it has been 7 yrs since I did maths and I still got it.

[16v_kid]

- One number (x) is 9 less than three times a second number (y). If the first number (x) plus twice the second number (y) is 16, find the two numbers.

Similar deal again (assuming your first word is meant to be one):
Eqn. 1: x = 3y - 9
Eqn. 2: x + 2y = 16

Good to see you're studying.

Cheers,
Trent

Thats the kind of info i was after!

Online teacher. ahahah

It really helps. Thank you alot.

Cheers,

Gordan.

[Preen59]

Holy crap i've just realised how much my maths skill has dwindled away.. Baaaaad.

[maca]

NERDS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! But come to think of it, I actually enjoyed maths (even though I did non-OP maths)

any of you guys wanna do the hsc for me too while ya at it?

I also enjoyed QCS. Weird, the fact that everyone in your state is doing the same test as you and I actually found it ok. It's dead silent, you've got time to think, concentrate and focus. 3 things I can't do anymore

[Big Yellow]

how many of you guys back in school were like "but ill never use maths in real life" HAHAHAHA.

[dubbed]

Holy crap i've just realised how much my maths skill has dwindled away.. Baaaaad.

lol me too! I so don't miss Methods...