need help could someone walk me through this....6x+9-4x=3x+11

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- anonymous

need help could someone walk me through this....6x+9-4x=3x+11

- katieb

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- anonymous

ok. So first pick what side you want to have the x's in. normally they are on the left side.

- anonymous

so get your x's on the left side following your oder of operations.

- anonymous

combine the terms right

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- anonymous

yup

- anonymous

what do you get?

- anonymous

You should get 6x-4x-3x=11-9

- anonymous

did you get this?

- anonymous

rt sorry typing sucks

- anonymous

yes

- anonymous

o.k now combine the terms.

- anonymous

just add/ subtract respectively

- anonymous

what do you get?

- anonymous

13x-11-9

- anonymous

13x=11-9

- anonymous

remember we want to keep the x's with the x's and the integers with the integers.

- anonymous

dont forget about your signs. Look at the signs: 6x-4x-3x

- anonymous

notice that we are adding two negative numbers.

- anonymous

remember (-3)+(-3)=-6

- anonymous

-6-6=-12

- anonymous

-13

- anonymous

the only time when two negative numbers become positive is when we multiply them

- anonymous

right gotthat

- anonymous

so what would -4x-3x be?

- anonymous

-7x

- anonymous

cool. So what is 6x-7x

- anonymous

-1

- anonymous

almost. -x

- anonymous

forgot 1x is same asx

- anonymous

so we got the left side taken care. The right side should give us 2

- anonymous

so we have -x=2. we are almost done

- anonymous

all that is left is getting rid of the negative. All we need to do is divide by a negative.

- anonymous

so the answer is x=-2.

- anonymous

see i get lost on when to change the operation like sub to add or change neg to pos

- anonymous

whenever you have the equation in just x's on one side and integers on the right, then you can divide.

- anonymous

3x=53, x=53/3. Its ok to divide.
3x=53+5x, you can divide but it will just be messy: x=(53+5x)/3. Besides we have to solve for x and that just complicated things.

- anonymous

3x-5x=53, -2x=53, x=-53/2

- anonymous

ok so when i see a - sign its the same as neg

- anonymous

correct.

- anonymous

3x-5x is -2x......but when i have an equation here let me show u if u have time?

- anonymous

yeah. its cool. show away.

- anonymous

4(3x-5)=-4x+27

- anonymous

what screws me up is when im not sure if i add or sub

- anonymous

so its 12x-20=4x+27

- anonymous

then move the smaller x ?

- anonymous

its really up to you. It does not matter. The answer will work out the same.

- anonymous

you just have to remember to keep your x's with your x's on one side of the equation and your integers on the other side.

- anonymous

whether you want to keep the x on the right or left side it does not matter.

- anonymous

12x-4x=27+20 -20-27=4x-12x
8x=47 -47=-8x
x=47/8 47/8=x (negatives cancel.)

- anonymous

makes sense sry im really not sow....lol always had problem with math

- anonymous

slow..lol

- anonymous

math just takes time. After graduating from high school i did my own thing for 4 year not worrying about school. After 4 yrs I decided to go to college. Took a placement test and place in pre-algebra. I have been working my way up ever since.

- anonymous

just be patient with it.

- anonymous

thats exactly what im doin now...but its been 14 yrs since ive been to school

- anonymous

what math u doin now

- anonymous

im in differential equations and linear algebra.

- anonymous

cool hey thx for ur help im keith btw

- anonymous

r u on here often

- anonymous

no worries. yeah. Im usually asking questions as well. We all need help.

- anonymous

well good luck on your math studies.

- anonymous

u too take care

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