The Official Homework Help Thread

[Fleshy]

old thread but heeeyyy help me out pls

basically, someone was selling tickets because money am i right. they sold 2000 tickets.
x tickets sold for 800 kr each
y tickets sold for 550 kr each
1 539 500 kr in total was earned

so ik that the answer is y=242 and x=1758 but how tf do i do that without guessing..............,

(1) x + y = 2000
(2) 800x + 550y = 1,539,500

multiply equation 1 by -800
-800 (x + y = 2000) = -800x + -800y = -1,600,000

then add the new equation to equation (2)
(2) 800x + 550y = 1,539,500
(1) -800x + -800y = -1,600,000

adding them together gives you;
0x - 250y = -60500
y = 242 (so yeah y=242)

x + y = 2000
x + 242 = 2000
x = 1758


I hope this helps, i just kind of done it without explaining much tho so if it's confusing i'll explain it out

 

[visibleghost]

(1) x + y = 2000
(2) 800x + 550y = 1,539,500

multiply equation 1 by -800
-800 (x + y = 2000) = -800x + -800y = -1,600,000

then add the new equation to equation (2)
(2) 800x + 550y = 1,539,500
(1) -800x + -800y = -1,600,000

adding them together gives you;
0x - 250y = -60500
y = 242 (so yeah y=242)

x + y = 2000
x + 242 = 2000
x = 1758


I hope this helps, i just kind of done it without explaining much tho so if it's confusing i'll explain it out

oh wow thank you so much!! it took me a while to understand everything but i finally get it now, thank you sooOooo much ;W;

 

[Fleshy]

Girls and guys, I'm just curious. Has anybody of you used any online writing service? I've been given a written assignment I don't have time and desire to do. I'm considering trying some essay writing services . Folks, share you experience please, if you have one!

Is that where you get your essay written for you? I haven't and I personally don't think they are a very good idea, my university has strict rules on plagiarism and tracks sites like this, I'm not sure how serious this assignment is, but i'd just be careful!

 

[TheGlamourGroup]

I'm on summer vacation for now

 

[Fleshy]

Does anyone need help with anything? Preferably maths or science related but it really doesn't matter, I'm super bored.

 

[Aali]

Oh hey look at dis O_O

I can help with like English/writing junk. Always got A+ in journalism and English class I ain't writing your stuff for you I hate plagiarism/ghost writing

 

[guardgirl]

I realize this is old, (this explanation could help others in the future, or could give the op another way to look at it) but another way to explain this (and personally, my go to) its basically exactly what the previous answer did, but this explains why you do those steps.

x+y=2,000
800x+550y=1,539,500

take the simplest equation (in this case, the top) where there is at least one variable that has a coefficient of 1, (if it doesn't but it's possible, do it. i.e. 2x+40y=100 -> x+20y=50) and get that variable by itself

x=2,000-y

now plug the 2000-y wherever you see an x in the other equation, and multiply it out

800(2000-y)+550y=1,539,500
1,600,000-800y+550y=1,539,500

combine like terms and isolate the variable

1,600,000-250y=1,539,500
-250y=-60,500

solve for y by dividing by the coefficient

y=242

plug this into the first equation

x+y=2,000
x+(242)=2,000
x=1,758

check your work to make sure its accurate, and youre good as gold.

1,758+242=2,000
2,000=2,000

1,406,400+133,100=1,593,500
1,593,500=1,593,500

 

[Fleshy]

I realize this is old, (this explanation could help others in the future, or could give the op another way to look at it) but another way to explain this (and personally, my go to) its basically exactly what the previous answer did, but this explains why you do those steps.

Yeah, I said I would have written out the explanations if he needed, I probably should have just written them out, but this is great anyway and will probably help someone!!

 

[Wholockian]

Okay, so I just want to know if I'm doing this question right?

Calculate the discriminant of the quadratic 5x^2+2x+1. Hence show that 5x^2+2x+1>0 for all values of x

(If you can't read my handwriting, I apologise. My handwriting isn't very neat ;3

 

[KarlaKGB]

well for some reason ur using 3 squared, when b = 2

either way the discriminant is still < 0 which means u have no real roots and so all values of y must be positive.

 

[Wholockian]

well for some reason ur using 3 squared, when b = 2

either way the discriminant is still < 0 which means u have no real roots and so all values of y must be positive.

Ah! Cropped out the wrong question ;3;



Thanks though! The teacher was kinda in a rush to get over to the main school, so we didn't cover much on it before the end of the lesson. (And then we got homework on it) Glad I'm not just writing pages of nonsense

 

[Bunnilla]

When you got an F on both ur algebra tests ;-;

- - - Post Merge - - -

Probably going to the after-school thing to understand it more

 

[chapstick]

"draw a horizontal number line with mixed numbers between 0 and 2, with an interval of 1/3 between each pair of mixed numbers"
does that mean the individual ones should be in sixths
please help

 

[Xylia]

Hi! Astronomy question:

What path does the Sun trace out on the celestial sphere as the Earth orbits the Sun? Why? How is this related to the zodiacal constellations?

I know its referring to ecliptic and the zodiac constellations lie along this line.. Idk how to put it into full sentences

 

[Bunnilla]

I NEED HALP! I have a problem that is a^(2)+b^(2)=c^(2) but I have no idea where to go next.

the 2's are exponents and it's solve for c

 

[That Zephyr Guy]

I NEED HALP! I have a problem that is a^(2)+b^(2)=c^(2) but I have no idea where to go next.

the 2's are exponents

That's very nondescript. Could you explain what you're trying to do with the problem?

 

[Bunnilla]

That's very nondescript. Could you explain what you're trying to do with the problem?

oh yeah I'm so sorry forgot to mention, solve for c

 

[brownboy102]

oh yeah I'm so sorry forgot to mention, solve for c

Is it a Pythagorean theorem question? Because, seeing the equation, it's all I can think of.

 

[Bunnilla]

Is it a Pythagorean theorem question? Because, seeing the equation, it's all I can think of.

omg yes exactly that's what it said in front, and we didn't learn that yet? so idk what to do

 

[That Zephyr Guy]

oh yeah I'm so sorry forgot to mention, solve for c

With this theorem you generally want to square side A and side B. (This is A^2 and B^2). Then you add them together.

This gives you C^2, but that doesn't tell you the exact value for side C. To find that, you have to "undo" the exponent for C. This is done by finding the Square Root of C.

So in short, this is how you solve for C: Sqrt(A^2+B^2)=C


Essentially what this equation is used for, is for finding the hypotenuse of a right triangle. (The diagonal side). If you have the values for the other two sides, this equation will tell you how long the 3rd side is.