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Mathematics 16 Online
OpenStudy (opal13):

PLease help

OpenStudy (opal13):

OpenStudy (hafeda):

@Opal13 subtract and x's and bring the constant on one side and after divided by the coefficient of x

OpenStudy (opal13):

Can you give me an example please?

OpenStudy (hafeda):

so -3x-x = 12-8 -4x = 4

OpenStudy (hafeda):

@Opal13 now u can divide both side by 4 to get x alone and your answer

OpenStudy (opal13):

So, first you need to minus 8 from both side?

OpenStudy (hafeda):

yes get the constant on one side of the equation and unknown on the other side after that apply math rules and solve

OpenStudy (opal13):

So 8-3x-x = 12 - 8?

OpenStudy (opal13):

But then 8-3x won't work, will it?

OpenStudy (hafeda):

yes but because you are subtracting -8 from on side u have to do the same amount on the other side of the equation as well to balance out so it will look like as follow : 8-3x-x-8 = 12-8

OpenStudy (opal13):

Ok so then it will be 5x = 4?

OpenStudy (hafeda):

Yes, but -3x -x equal -4x. because they are both negative

OpenStudy (opal13):

Ok, then -3x/ 3 = -4 / 3?

OpenStudy (hafeda):

yes, but rememeber if -3x-x = 4 so u have -4x = 4

OpenStudy (opal13):

-3x/3 = 4/3

OpenStudy (opal13):

?

OpenStudy (hafeda):

let me ask you a question Opal what is 3x+x equal

OpenStudy (hafeda):

no, u have -4x = 4 x = -1

OpenStudy (opal13):

3x

OpenStudy (hafeda):

if u have 3x and 1x what will be your answer

OpenStudy (opal13):

You mean 3x + 1x, or 3x - 1x?

OpenStudy (opal13):

If it's 3x + 1x it will be 4x

OpenStudy (opal13):

If it would be 3x - 1x it would be 2x

OpenStudy (hafeda):

yes but in your case now you have (-3x -x) NOT ( 3x -x ). do u see the difference between them

OpenStudy (opal13):

yes, now I see

OpenStudy (opal13):

So we were -3x = 4

OpenStudy (opal13):

Now do we need to devid both sides with -3 or 3?

OpenStudy (hafeda):

OK so what does -3x - 1x equals to

OpenStudy (opal13):

-4x

OpenStudy (hafeda):

OK so u have -4x = 4 now what

OpenStudy (opal13):

now -4x/ 4 or -4x/ -4?

OpenStudy (hafeda):

what number or value is the coefficient of x, is it -4 and 4

OpenStudy (opal13):

-4

OpenStudy (opal13):

I think

OpenStudy (hafeda):

yes u r right now -4 now divide both side my -4

OpenStudy (hafeda):

\[8- 3x-x - 8 = 12 - 8\] \[-4x = 4\] \[\frac{ -4x }{ -4 } = \frac{ 4 }{ -4 }\] \[x = -\frac{ 4 }{ 4 }\] \[x = -1\]

OpenStudy (hafeda):

the reason i made u did the entire process is to learn it by yourself, Hope u got some idea on how to solve it.

OpenStudy (opal13):

Thanks a lot!

OpenStudy (hafeda):

glad to help

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