dam I suck at math :(

[lyssword]

Ok anyways there was a word problem on my test, so I converted it into equation.
Find x and Y.
120x+60y= 720 (-3)
200x+80y=1080 (2)
-------------------------


so I estimated that 80x2 and 60x3 would be the same, but later I figured out where I was wrong.

it should have been x(-4) and (2)

That's it, i'm never estimating again, because apparently I suck at it. I'll do everything with a calculator :|

 

[CraKaJaX]

How old are you?

 

[imported_LoKe]

Dude, I just had to look up how to do long division. I have NEVER done long division in my life.

...FUCK THIS.5__
4) 950
---8
---15
---12
----30
----28
-----20
-----20
------0

 

[rocadelpunk]

Originally posted by: lyssword
Ok anyways there was a word problem on my test, so I converted it into equation.
Find x and Y.
120x+60y= 720 (-3)
200x+80y=1080 (2)
-------------------------


so I estimated that 80x2 and 60x3 would be the same, but turns out it was wrong that's why I couldn't figure it out.

it should have been x(-4) and (2)

That's it, i'm never estimating again, because apparently I suck at it. I'll do everything with a calculator :|

probably would've been simpler to just divide the first equation by 60 giving you

2x + y = 12

dividing the second equation by 20 gives

10x + 4 y = 54


now you can either substitute and solve or multiply the first equation by -4 and add

so -8x - 4y = -48
10x + 4y = 54

2x = 6
x=3

: )

 

[lyssword]

Originally posted by: rocadelpunk

Originally posted by: lyssword
Ok anyways there was a word problem on my test, so I converted it into equation.
Find x and Y.
120x+60y= 720 (-3)
200x+80y=1080 (2)
-------------------------


so I estimated that 80x2 and 60x3 would be the same, but turns out it was wrong that's why I couldn't figure it out.

it should have been x(-4) and (2)

That's it, i'm never estimating again, because apparently I suck at it. I'll do everything with a calculator :|

probably would've been simpler to just divide the first equation by 60 giving you

2x + y = 12

dividing the second equation by 20 gives

10x + 4 y = 54


now you can either substitute and solve or multiply the first equation by -4 and add

so -8x - 4y = -48
10x + 4y = 54

2x = 6
x=3

: )

Ah, I see, reduce the numbers instead of increasing. If I were working with smaller numbers I would have instantly seen the mistake. Thx for the tip

 

[DrPizza]

Originally posted by: LoKe
Dude, I just had to look up how to do long division. I have NEVER done long division in my life.

...FUCK THIS.5__
4) 950
---8
---15
---12
----30
----28
-----20
-----20
------0

Really?? Life's really going to suck for you if you ever have to do polynomial long division.

i.e. 4x^5 + 3x^4 - 7x^3 + 8x - 9 all divided by x^2 + 6x - 2

 

[Pepsi90919]

what about DAM

 

[Oil]

Cramer's Rule

 

[imported_LoKe]

Originally posted by: DrPizza
Really?? Life's really going to suck for you if you ever have to do polynomial long division.

i.e. 4x^5 + 3x^4 - 7x^3 + 8x - 9 all divided by x^2 + 6x - 2

I can divide with no problem, I just do it in my head, rather than the elaborate long division method. Also, I suck at anything but basic math.

 

[TwiceOver]

I remember multiple math teachers telling the class that this would be important some day.

Still waiting for that day.

 

[bonkers325]

multiply the first equation by -4/3 and you get -160x - 80y = -960, then u add equation one to equation two and you get 40x = 120 and x = 3. plug x = 3 into equation 1 or 2 and u will get y = 6.

if you are so inclined, u can also solve this very quickly with a calculator. set up a 2x2 matrix (120 60, 200 80), invert it, then multiply it by a 2x1 matrix (720, 1080) and you will get (3, 6).

 

[lyssword]

Originally posted by: Pepsi90919
what about DAM

Don't want to summon the wrath of ATOT gods, dam sounds more innocent than damn. Come to think of it, I don't think I should use dam as it is a variation of religious swearing, and I shouldn't support it because I'm agnostic. But I usually don't think about things like that I guess

 

[Cattlegod]

the answer is 480, obviously

 

[So]

spelling too, apparently. Hopefully "day laborer" is your forte'.