Maths Help :)

[PlanetaryRasengan]

My little brother isnt exactly the brightest math student and i have completely forgot how to help him with this problem.

2x - 8 < -13

He needs to know how to work it out so if you could help him that would be greatly appreciated.

 

[Ciao]

x< -5/2

There you go.

 

[NeverEnding]

X=11!!!! There you go!!!

 

[Hipster Madara]

My little brother isnt exactly the brightest math student and i have completely forgot how to help him with this problem.

2x - 8 < -13

He needs to know how to work it out so if you could help him that would be greatly appreciated.

Are you serious?

Whatever.


2x - 8 < -13

1. 2x < -5
2. x < -2.5


Hope it's not wrong. >__>

 

[PlanetaryRasengan]

Ok so i have 2 different answers ^^ who is corrrect...?

 

[Hipster Madara]

Ok so i have 2 different answers ^^ who is corrrect...?

They're the same thing....

 

[Ciao]

Ok so i have 2 different answers ^^ who is corrrect...?

My answer and Hipster Madara's answer is the same thing.

 

[ZioN AmaZe]

x<5
Doin it in class right now

 

[Commander Axe]

Hipster and Orochimaru fan is correct.

 

[PlanetaryRasengan]

Um how the hell is -5/2 the same as 11? I understand that -2.5 is the same as the fraction but please do explain how 11=-2/5...

 

[Kages]

X<-2.5

There you go!

 

[Hypemaster]

Um how the hell is -5/2 the same as 11? I understand that -2.5 is the same as the fraction but please do explain how 11=-2/5...

They're talking about -5/2 and -2.5 being the same

 

[Iruka]

Um how the hell is -5/2 the same as 11? I understand that -2.5 is the same as the fraction but please do explain how 11=-2/5...

The answer is x < -2.5. The person who answered 11 was just being an ass.

The question is a basic inequality.
2x - 8 < -13
2x < -5
x < -5/2

Which can be expressed as a decimal:
x < -2.5

 

[Drizzy]

2x-8 < -13
What this is saying, is that 2x-8 is less than -13. The aim is to get 1x (or just x) on one side by itself.
2x < -13 + 8
What I did here, was move the -8 before the < sign, moving it across the sign makes it the opposite which is a positive (+) 8.
2x < -5
Here, all I did was simplify. Negative thirteen (-13) added to positive eight (+8) is negative five (-5).
2x/2 < -5/2
X is still not on it's own, that's 2x and not x there. To get only x, we must divide by a number that will leave only x. That number is two, because we do this to 2x, we must also divide the other side by 2 for it to be equal.
x < -2.5
2x divided by two is x, -5 divided by two is negative two and a half (-2.5)

 

[Hipster Madara]

2x-8 < -13
What this is saying, is that 2x-8 is less than -13. The aim is to get 1x (or just x) on one side by itself.
2x < -13 + 8
What I did here, was move the -8 before the < sign, moving it across the sign makes it the opposite which is a positive (+) 8.
2x < -5
Here, all I did was simplify. Negative thirteen (-13) added to positive eight (+8) is negative five (-5).
2x/2 < -5/2
X is still not on it's own, that's 2x and not x there. To get only x, we must divide by a number that will leave only x. That number is two, because we do this to 2x, we must also divide the other side by 2 for it to be equal.
x < -2.5
2x divided by two is x, -5 divided by two is negative two and a half (-2.5)

You did the same thing, just showed a mid-step for -13 + 8 and /2.

 

[Trollo Lucilfer]

2x - 8 < -13

2x < -13 + 8
2x < -5
1/2 * 2x > -5 * 1/2
x > -5/2

 

[King-Panda]

2x - 8 < -13


2x < -5

x < -2.5

I still remember this.... I am young, but last year gave tutoring sessions on maths and science to the year bellow!! business business!

 

[Hipster Madara]

I think he got it guys. :sy:

*abandons thread*

 

[Trollo Lucilfer]

I think he got it guys. :sy:

*abandons thread*

More methods = more help

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[Drizzy]

You did the same thing, just showed a mid-step for -13 + 8 and /2.

Ah, I was unsure since you skipped a few steps. He did say he wasn't sure how to do it, simplifying it would be best to do. ^^