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Mathematics 18 Online
rootbeer003:

help

rootbeer003:

1 attachment
rootbeer003:

@Hero @Elsa213 @dude

Hero:

How much was the initial fee for Jimmy's gym membership?

rootbeer003:

uhh $70?

Hero:

We'll come back to that. How much was Jimmy's monthly membership fee?

rootbeer003:

idk it doesnt say

rootbeer003:

"Both gyms charge a one-time initiation fee plus a set cost per month."

Hero:

It does say. You have to use context clues

rootbeer003:

$10

rootbeer003:

set cost per month

Hero:

How much is the difference in cost from month two to month three for Jimmy?

rootbeer003:

$10?

Hero:

Ah I see. Maybe it is $10

Hero:

They skipped boxes for some months.

rootbeer003:

2 - 80 3 - 90 4 - 100 5 - 110

Hero:

Good

Hero:

Okay, so you know the initial fee and the cost per month so how can we write an equation to represent Jimmy's monthly cost?

rootbeer003:

y = 10x + 70 ?

Hero:

Yes. Now we have to do the same for the other guy

rootbeer003:

ok

rootbeer003:

y = 15x + 50

Hero:

Okay, so you should be able to set both expressions equal and solve for x

Hero:

x representing the month both are paying the same amount

rootbeer003:

10x + 70 = 15x + 50 ?

Hero:

Looks good

rootbeer003:

One sec, i always struggle at this part

Hero:

How, why?

rootbeer003:

I know I'm supposed to get X on one said but

rootbeer003:

I know I'm supposed to get X on one said but

rootbeer003:

Do i start out with Dividing either 10x or 15x?

rootbeer003:

side*^^

Hero:

You're supposed to subtract the like terms first

rootbeer003:

Oh really

rootbeer003:

I thought first, you get rid of one of the x's.

Hero:

subtract and see what happens

rootbeer003:

do i subtract it from the variables too?

Hero:

Yes

rootbeer003:

So i subtracted 50 and got -40x+20=-35x

Hero:

Yeah you did that all wrong. Subtract the smaller numbers from the bigger numbers

Hero:

What you should have done: 70 - 50 = 15x - 10x

rootbeer003:

50 is smaller than 70

rootbeer003:

50 is smaller than 70

Hero:

You're a genius.

rootbeer003:

I didnt put the x's all on one side

Hero:

You should do it the exact way I've shown.

Hero:

70 - 50 is subtracting the smaller from the bigger BTW

Hero:

50 is the smaller number being subtracted from the bigger number 70, thus 70 - 50

rootbeer003:

yeah i know

rootbeer003:

Problem was, i thought i would get rid of one of the X's so i didnt put constants w/ constants or variable w/ variables

rootbeer003:

like this, here's an example

rootbeer003:

1 attachment
Hero:

you end up with 20 = 5x

Hero:

Then divide both sides by 5

rootbeer003:

4= x

rootbeer003:

um

Hero:

We can check that to make sure

Hero:

See if both month 4 values are the same

rootbeer003:

1 attachment
rootbeer003:

Clearly not

rootbeer003:

@Vocaloid

Hero:

I was going with the values you created yourself. If they are not right then the next step is to go back and make sure they are all correct.

rootbeer003:

No, my values are just fine, your answer is just wrong

rootbeer003:

Jimmy Gymboree 1= 70 1= 35 2= 80 2= 50 3= 90 3= 65 4= 100 4= 80 5= 110 5= 95 6= 120 6= 110 7= 130 7= 125 8= 140 8= 140

rootbeer003:

They meet on month 8

Hero:

1st, it's not my value, it's your value based on your equations you came up with.

Hero:

2nd, you need to go back and make sure the values for initial fee and monthly fee are correct

rootbeer003:

Yeah that's what I'm doing, the initial fee for Gymboree is 35 not 50

Hero:

Okay

rootbeer003:

Weird, i still end up with 7 and not 8

Hero:

10x + 70 = 15x + 35 70-35 = (15 - 10)x 35 = 5x 35/5 = 7 = x yep so something is still off.

rootbeer003:

I re-checked my table, it looks correct to me

Hero:

How do you figure?

rootbeer003:

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rootbeer003:

For Jimmy i added 10 and other guy is 15

rootbeer003:

@Vocaloid

rootbeer003:

im making a new post

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