Accelerated Evolution

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wait, no I need help on this problem.

5g + 9 = 2(g + 3)

5g+9 = 2g + 6

-9 -9

5g = 2g + -3

-5g -5g

-3g = -3

-3g/-3 = -3/-3

g = -1

is that right, seems weird. (i'm doing identities)

Edited by Lindsay

Edit: ^ looks right to me

Solving for g, right?

5g+9=2(g+3)

5g+9=2g+6

subtract 2g from both sides

3g+9=6

subtract 9 from both sides

3g=-3

g=-1

Edited by Arcane

waitt, sry XDD this one is hard.

4(k+2) - 4 = 2k

???? wtf

Ah!

4K + 8 - 4 = 2k

4K + 4 = 2K

4K - 2K = - 4

2K = - 4

K= - 2

( ^o^) <3

Ah!

4K + 8 - 4 = 2k

4K + 4 = 2K

4K - 2K = - 4

2K = - 4

K= - 2

( ^o^) <3

yup, yup...easy enough.

Ah!

4K + 8 - 4 = 2k

4K + 4 = 2K

4K - 2K = - 4

2K = - 4

K= - 2

( ^o^) <3

i was going to do that but, doesn't subtracting 2k from 4k go against order of operations, like left to right not right to left.

i was going to do that but, doesn't subtracting 2k from 4k go against order of operations, like left to right not right to left.

It doesn't matter. You can do it anyway you want, so long as you have the correct answer in the end! (^o^ ) <3 <3

i was going to do that but, doesn't subtracting 2k from 4k go against order of operations, like left to right not right to left.

no...because you bring the 2K over from the right side...and its positive there, so when you bring it over it becomes a negative.

4K + 8 - 4 = 2k

4K + 4 = 2K

4K - 2K = - 4

2K = - 4

K= - 2

OR

4K + 8 - 4 = 2k

4K + 4 = 2K

4 = - 4K + 2K

4 = - 2K

-2 = K

( ^o^) <3

oh ok.

one more, sorry:::

"The ratio of the number of girls in school to the number of boys is 8 : 7. If there are 378 boys in school, how many girls are in school?"

Edited by Lindsay

Yep, 432.

Yep, 432.

ditto

edit: hahah...i just noticed my post count...man...i should stop posting now lol

waitt, sry XDD this one is hard.

4(k+2) - 4 = 2k

???? wtf

4(k+2) - 4 = 2k

4K + 8 - 4 = 2K

4K + 4 = 2K

2K = -4

K = -2

Edit: damn I was a bit late, I'm playing EVE Online! give me a break

Edited by Grand Magus Salvarus

okay I really don't get this kind of problem:

x = y-z over 5

solve for y

You need to isolate the y.

Are you sure that's the problem? Seems like it's missing info.

I want to say that the answer goes something like this:

- 5 / Z + X = Y

I'll have to refer to my math book.

I can't tell what the question is. is it: x=(y-z)/5 or x=y-(z/5) ?

The first is y=5x+z, and the second is y=x+(z/5). is the exact problem.

solve for y

Edited by Lindsay

x=(y-z)/5

5x=y-z

5x+z=y

y=5x+z