Question

the light bulbs you use are sale. But you only get the lower price if you buy three packages of bulbs you want to know how much you save.
Write a formula that will help you determine how much you'll save by buying 3 packages on sale
let's let
s=sales price per package
r=regular price per package
c=cost savings

Answer 1

what you want to do is find out the cost savings. So what you have to do is get the regular prices for buying 3 bulbs, then get the sales prices of 3 bulbs. The cost savings lies in the difference. ;) Good Luck

Answer 2

i have no idea what to do :/

Answer 3

What he said is that you need to find out the normal price for buying 3 bulbs.
3r
r=regular price per package

Then he said what the SALES price for buying 3 bulbs is.
If s=sales price per package, then what is it now?

Answer 4

then what is what?

Answer 5

what is the equation for sales price, Hint:it's a LOT like the equation for regular price per package, just change a variable.

Answer 6

umm 3?

Answer 7

what is the variable for the sale price per package?

Answer 8

umm 6?

Answer 9

do you know what a variable is?

Answer 10

no lol

Answer 11

ah ok, a variable is a letter that can be any number, so we represent it with a letter. Such as r, can be a variable in 3r. r can be ANY number in the whole wide world and you can stick it into that slot. We choose it for formulas and such.
r is the variable for regular price per package. So what is s?

Answer 12

how would i figure out is

Answer 13

s*

Answer 14

You don't, what I'm asking is what does the variable s stand for in this problem?

Answer 15

sales price per package

Answer 16

great job! Ok, what does the variable c stand for?

Answer 17

cost savings

Answer 18

alrighty, so now do you understand a variable? Do you need any more help on that?

Answer 19

i just needa kno how to find the answer cause im takin a test

Answer 20

ok, 3r is the equation for the regular price of 3 bulbs.

since we know that, what is the sales price of 3 bulbs equation?

Answer 21

6?

Answer 22

no, it is an equation, not a number.

Answer 23

a formula, what is the formula for the sales price of 3 bulbs.

Answer 24

wdym formula

Answer 25

A mathematical relationship or rule expressed in symbols.

Answer 26

For example, the Pythagorean Theorem is a formula: \[A^2+B^2=C^2\]

Answer 27

ok so am i trying the formula?

Answer 28

right, we're building to that. I've given you the formula for finding the regular price per package for 3 bulbs. It is \[3r\]

Answer 29

3r s/c

Answer 30

we still have to get the formula for the sales price of 3 bulbs.

Answer 31

k

Answer 32

What does s stand for?

Answer 33

sales price per package

Answer 34

alright! So now that you know that, we're trying to make a formula for the sales price per package for 3 bulb packages.

Answer 35

so that would be 3s, right?

Answer 36

yes

Answer 37

okey doke. Ok,here's a bit of common sense. When you get a sale on something, you get some money taken off, right?

Answer 38

yes

Answer 39

ok, so the regular price is more, and we're trying to figure out how much we save by getting the bulbs on sale.
so what would the order of both formulas be? The formulas are 3r and 3s

Answer 40

you're subtracting one from the other

Answer 41

subtrcting what from the others

Answer 42

you're subtracting either 3r - 3s or 3s - 3r
Remember what the variables stand for and what we're trying to get in the end!

Answer 43

so would it just be 0

Answer 44

no, remember it is a formula. We're trying to figure out which way the formula is going to subtract.

Answer 45

is it
3r-3s=c
OR
3s-3r=c

Answer 46

the first one

Answer 47

great job!! You did really well :)

Answer 48

thanks! (:

Answer 49

your welcome, and do you think that you'll understand variables a bit more from now on?

Answer 50

ooh idk! ill try

Answer 51

if you need any help, you can ask me or ask on here.

Answer 52

the website, I mean, not this question.

Answer 53

okay! ;] but was the answer?

Answer 54

3r-3s=c

Answer 55

thx