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Okay I'm stumped.
Does the problem call for you to solve it?
I don't think so. It just says model the situation as a linear equation..
Maybe it's just x + y = 14
As a linear "system"?
A system of equations has more than one equation.
That's why I don't understand this...It's weird.
The term linear refers to the variables having no exponents. So, it's asking you to write those two equations using x and y
Don't you mean no coefficients?
Your first answer, X + Y = 14 is correct. You need to turn the Something minus something = 10 into a equation
Uh x -y = 10
Bam. That's it! X + Y = 14 X - Y = 10
And yup, a linear equation has no exponents. All of it's variables are to the first power.
Damn I'm stupid
I always think the problem is going to be hard, but it's hella easy.
Thank You once...again.
You're welcome. Also, Don't ever call yourself stupid, because you're not. Don't sell yourself short. If you keep telling yourself your stupid, you'll eventually believe it.
I'm stupid on this one question.
Okay now I'm stuck again.
What is an equation for one CD costing $2 more than the other? Do you know? >-<
Well, the first step is to assign variables, right?
You told me CDA = CD2 + $2, right?
Well both of the two Cds equal $28
We can use mathematics to describe relationships between things
What's the whole question?
You buy two CDs for a total of $28. One CD cost $2 more than the other.
-_- XC Bahh. I can't answer it.
? Sure you can.
It's asking you to write another system of equations, right?
First off, what's in a system of equations? What is it? And why do we use it?
We try to find the values of the unknown?
A system of equations is a list of equations. It has several equations, usually with more than one variable
Are you still here?
Okay. We use a system of equations to help solve for more than one variable.
With one equation, X + Y = 12, it's impossible to find what X and Y are. Can you tell me why?
Please tell me why. ^^
Because we need a real number. You can't just solve it with variables?
Nope. Try graphing it
unless you make up the numbers..
Variables exist within an equation, so we can put numbers in.
I think what you mean, is that there is an infinite amount of solutions, right?
In the equation (X+Y = 12), if X = 3, than Y = 9, if X is 10, than Y is 2, and so on
You can graph these points, and it makes a straight line. The straight line represents all of the answers that work in the equation.
Okay. Are you telling me then I can find the slope...? rise/run right?
The slope is a tool. It helps us graph the line, and it tells us how quickly it goes up or down. I'm explaining this to you, because I don't think you completely grasp graphing, or equations yet.
I know how to graph equations.
I usually use y=mx + b
I then graph it from there, or there are other forms I can graph from like standard form or point-slope form.
I undestand that you can graph. But do you understand why you graph?
Why do we graph?
We graph for a couple of reasons.
First off, pictures are easier to understand than really complicated formulas
Next, with a graph, we can solve equations that we don't know the answer of
Equations? That's only useful for math! But, remember what I said? We use math to describe how things are related
I'm going to give you two equations, and I want you to graph them, okay? When you graph them, you should be able to get the answer without doing any algebra.
You need to just plug in a few points, and then plot them.
X + Y = 12, and X - Y = 5
Graph them on the same graph.
(If that makes any sense :) )
Yeah it does. You can solve linear systems by substitution or graphing or elimination..
Okay it's 2:08am. It's not hat I want to not learn, but I need to goto sleep now. Thanks for the lecture.
If you graph the two lines, they should intersect at only one point. That's the only answer that's correct.
For your question, you need to write a system of equations.
Yeah they intersect, but I still think substitution is the easiest way out of all the methods I've learned.
It's the fastest. With the more complicated math, you'll suddenly love graphing
What itf you can't draw lines that well?
Erm, substitution is. And, the lines don't have to be perect.Anyway, You buy two CDs for a total of $28. One CD cost $2 more than the other.
also I know I have to write linear systems but I only think I have to write two.
x + y = 28 I know that's one.
I think the other is 2 - y ...
One CD + 2 = another CD, right?
Just substitute the variables
No the total cost of the two equals 28 dollars.
I don't need to solve it..
Yeah. But the 2nd clause says that one cd costs two more dollars than the other
That's an equation.
Oh I wrote an expression..
Oh I wrote an expression..
Oh I wrote an expression..
X + 2 = Y. Truthfully, it doesn't matter what variable +2 = the other variable.
Must be a glitch
Anyway, I'm sorry I wasn't the most helpful for the equation. God bless with your mathematic endeavors, and good night.
Ashag, are you still here? If so, go to your latest problem, and I"ll take a crack at it