Another desperate plea for help....

Fragile Dreams

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Dec 17, 2005
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Lin Hsia plans to invest $1400 in two stocks: Consolidated Industries (CI) and Amalgamated Manufacturing (AM).

Suppose that Lin's CI stock does not change in value, but her AM stock triples, making her stocks worth $3300. Write and equation that expresses this fact.

Would the equation be:

x + 3y = 3300

(x pertaining to CI; y relating to AM)
 
That looks good, but there is enough information given to say how much each stock was and is worth. Are you reading the problem correctly?
 
Yes, it's writen exactly as it says in the book...

In the next question (still pertaining to the same situation) it asks:

Find out how much she invested in each company by solving the equation you wrote in Exercise 35.
 
Ahhh, that's the question I was expecting. You need another equation though.
 
Hmm, maybe I'm not understanding you right...

Wouldn't I still use x + 3y = 3300 to find out how much she invested?

How would I do an additional equation pertaining to the same situtation?
 
From the first paragraph. With two unknowns you need two equations to solve it.
------------------
Gene
 
Alright, I'm just going to apologize now. I'm sorry for being such a block-headed hassel.

Perhaps you could go through it step by step, or elaborate...? You've completely lost me...

Sorry...-_-
 
You're sharp enough to solve it. The first paragraph says
x+y=1400.
With
x+3y=3300
you can find x & y.
----------------
Gene
 
Fragile Dreams said:
So, simplified, it's x + y = 1100?
Which is "x + y = 1100"?

We're glad to help you find your errors, but you need to tell us what you did, in order for us to do that. Please show your steps and reasoning. Thank you.

Eliz.
 
Lin Hsia plans to invest $1400 in two stocks: Consolidated Industries (CI) and Amalgamated Manufacturing (AM).

(35) Suppose that Lin's CI stock does not change in value, but her AM stock triples, making her stocks worth $3300. Write and equation that expresses this fact.

My Ans: x + 3y = 3300
Simplified: x + y =1100 (?)

(36) Find out how much she invested in each company by solving the equation you wrote in Exercise 35.

My Ans: ???
 
Nope, it doesn't work that way. You have to divide the whole left side by three. That would give
x/3+y=1100
But that isn't the way to go. Subtract one equation from the other and see what happens.
 
NOT THAT ONE! I told you it was wrong. Use the originals.
x+3y=3300
x+y=1400
Subtract them.
--------------
Gene
 
Hmmmm.
x+3y=3300
x+y=1400

Checking:
450+3*950 = 3300
450+950= 1400
It works! Phew
--------------
Gene :evil:
 
Fragile Dreams said:
Lin Hsia plans to invest $1400 in two stocks: Consolidated Industries (CI) and Amalgamated Manufacturing (AM).
Suppose that Lin's CI stock does not change in value, but her AM stock triples, making her stocks worth $3300. Write and equation that expresses this fact.
Would the equation be:
x + 3y = 3300
(x pertaining to CI; y relating to AM)
Gee, FD, yer sure having problems....RELAX!!

OK; we're told: "Lin Hsia plans to invest $1400 in two stocks...CI and AM.."
Let x = CI stock, y = AM stock
SO: x + y = 1400 .... OK?

Then we're told: "AM stock triples making stocks worth $3300.."
SO: x + 3y = 3300 .... OK?

If you subtract those 2 equations, you get 2y = 1900 .... OK?

So if 2y = 1900, then y = 950 ... right?

So we can sustitute that in the equation x + y = 1400:
x + 950 = 1400
x = 550 ... so now we know the CI value.

Edit: whoops, sorry Gene :shock:
 
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