help with rules relating L, W, and P, from table of values

E

emsy.wemsy

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Joined
Apr 28, 2009
Messages
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i have a maths project and dont understand how i could do this

could you please help me work out a rule that works for all of these:

L W P
2 4 4
6 3 6
6 2 6
6 4 8
6 9 12
6 8 12
6 10 14
3 9 9

rule: L + W - lowest common factor

L W P
1 1 1
2 2 2
3 3 2
4 4 4
5 5 5

rule: L + W - L

L W P
2 1 2
2 3 4
3 2 4
3 4 6
4 3 6
4 5 8
5 6 10
5 7 11
5 8 12
5 9 13

rule: L + W -1

is it possible to merge these rules and is there a rule that works for all of them?
 
Re: help with rules

emsy.wemsy said:
i have a maths project and dont understand how i could do this

could you please help me work out a rule that works for all of these:

L W P
2 4 4
6 3 6
6 2 6
6 4 8
6 9 12
6 8 12
6 10 14
3 9 9

rule: L + W - lowest common factor

L W P
1 1 1
2 2 2
3 3 2 <<<<<<< This line does not follow rule
4 4 4
5 5 5

rule: L + W - L

L W P
2 1 2
2 3 4
3 2 4
3 4 6
4 3 6
4 5 8
5 6 10
5 7 11
5 8 12
5 9 13

rule: L + W -1

is it possible to merge these rules and is there a rule that works for all of them?
Click to expand...

What have you learned about domain and range of function?

Please show us your work , indicating exactly where you are stuck - so that we know where to begin to help you.
 
Re: help with rules

i have worked out p so far by drawing up grids as we have to work out how many P(properties) the line crosses. L(length of property) W(width of property)

i am stuck at working out a rule that works for all three grids

could you please explain how i could work it out?

i tried adding and simplfying but it didnt work
 
emsy.wemsy said:
i have worked out p so far by drawing up grids as we have to work out how many P(properties) the line crosses. L(length of property) W(width of property)
Click to expand...
How did you arrive at this conclusion? I see nothing in the original exercise that gave "meanings" to the variables...?

Also, are two of the variables "inputs", and one of the variables the "output"? If so, which is which?

emsy.wemsy said:
i am stuck at working out a rule that works for all three grids
Click to expand...
Did the instructions require you to try to find such?

Please reply with the full and exact text of the exercise (including a response regarding the second table of values), and the complete instructions. When you reply, please explain your reasoning by which you concluded, for instance, that "P" means "property", and how you defined this term.

Thank you! :D
 
introduction:
the surge electricity company needs to lay underground power cabels from one corner to another.

the company needs to know how many properties (squares) the cable will cross.
let L be the number of properties which form the length of the block
let W be the number of properties which form the width of the block
let P be the number of properties the cable crosses

i need to work out a rule that finds the lowest common factor and i have spent all night on this

please help

please :cry:
 
emsy.wemsy said:
introduction: the surge electricity company needs to lay underground power cabels from one corner to another.

the company needs to know how many properties (squares) the cable will cross.
let L be the number of properties which form the length of the block
let W be the number of properties which form the width of the block
let P be the number of properties the cable crosses
Click to expand...
Are you given any information regarding "properties", "corners", "width", or "block", or the relationships between these terms? (It almost sounds like there should be a picture that goes with this exercise...?)
 
emsy.wemsy said:
?they do but do you know the rule on how to get the lowest common factor?
Click to expand...

Do you, perhaps, mean highest common factor? After all, the lowest common factor of any two numbers is 1.

There are algorithms for working out hcf (also called gcd, for "greatest common divisor"), there may even be a complex "formula". However, usually you are allowed to use it as a basic function in its own right, eg "L + W - hcf(L,W)" or "L + W - gcd(L,W)" or "L + W - hcf(L,W), where 'hcf(a,b)' means 'the highest common factor of a and b'"
 
the lowest common factor is one


but you would need to write except 1.

can you still write in a rule L + W - HCF? highest common factor??

i am one of the only girls who havnt worked out the rule

and nobody wants to help me

please help
:'(
 
emsy.wemsy said:
i am one of the only girls who havnt worked out the rule

and nobody wants to help me

please help
:'(
Click to expand...

We can only help with problems we UNDERSTAND. Several of our volunteers have indicated that there are parts (MAJOR parts!) of your problem that are not clear. I think, given the information we have had to work with, we've done about as well as anyone could expect.

If the "other girls" have figured it out, you might want to ask THEM how they got the answer.

I admit to being very much in the dark about what you're being asked to do.
 
i have a thousand times

i need to find a rule that works for all of them

L + W - 1

is there another rule that works the same as that?
 
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