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/sci/ - Science & Math

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2646641 No.2646641 [Reply] [Original]

How the FUCK do I do this question /sci/?
Yes I'm retarded and google won't help.

>> No.2646647

multiply everything by zero

>> No.2646651

>>2646647
0 = 0 is true, but doesn't answer the question.

>> No.2646652

x = -1

>> No.2646655

>>2646652
Yes, but how do I get there?

>> No.2646661

simplify the whole equation first then group the variables in a single side, simplify more so you can solve for x.

>> No.2646662

multiply everything by 150 and be a boss 10(x+5)-15(x-5)=150+20x

>> No.2646664

>>2646662
your fucking retarded

>> No.2646667

>>2646662
That's wrong.

>> No.2646668

>>2646662
lowest common factor is 30. use that instead of 150.

>>2646664
*you're

>> No.2646676

>>2646668
I've got
-x+25 4x
--------- = 1 + -------
30 30
I'm terrible with fractions.

>> No.2646677

2(x+5)-3(x-5) = 30 +4x
2x+10-3x+15 = 30 + 4x
25 - x = 30 + 4x
5x = -5
x = -1

>> No.2646681

>>2646676
God damn.
Formatting messed up there.
>>2646677
How do you even get
>2(x+5)-3(x-5) = 30 +4x
?

>> No.2646689

>>2646655
30((x+5)/15) - 30((x-5)/10) = 30(1) + 30(2x/15)
(30x+150)/15 - (30x-150)/10 = 30 + 60x/15
2x + 10 - 3x + 15 = 30 + 4x
25 - x = 30 + 4x
-5 = 5x
-1 = x

>> No.2646691

>>2646681
multiply everything in OP's equation by 30.

>> No.2646698

>>2646691
Thanks so much man!
Was stuck on that question for ages.

>> No.2646701
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2646701

>>2646698
no problem.

>> No.2646707

jesus fucking christ it's 15 yr old junior math in here

>> No.2646709

>>2646707
at least it is math, and therefore /sci/ related. which puts it above the majority of threads that are posted here.

>> No.2646712

Okay, I feel like a douche for asking another question, but I was literally stuck on this one for over an hour.
Sounds pretty stupid, but yeah I couldn't figure it out at all.
"A man has to travel 50km in 4 hours. He does it by walking the first 7 km at x km/h, cycling the next 7 km at 4x km/h and motoring the remainder at (6x + 3) km/h. Find x."
>>2646707
I'm 16 and in the highest level maths for my age.
;_;

>> No.2646721

get all x's on same side of equation, find common denominators, eliminate denominators on x side and solve for x

>> No.2646732

>>2646712

Well, you know that the sum of the distances he went by each method is 50 km, right?

So try putting that into an equation.

>> No.2646736

middle school algebra homework in /sci/?

>> No.2646756

>>2646736

Yeah, that should really shock you

>>2646732

OP, keep in mind this is only the first step to building the equation. There's an additional step to make it correct, which you can get by look at the units (km on one side of the equation, and km/h on the other)

>> No.2646766

>>2646712
This is really basic algebra.
Brotip: Work out how long he spent in each mode of transportation. I'll give you the first one - he spent x/7 hours on foot.