#1
Hey guys, I'm studying right now for a test, and I would like to ask some things about graphing and the like, 'cause I don't understand the concepts too well;
1. What is the vertical line test?
2. What is the Y-intercept and X-intercept?
3. There's this thing about looking at an equation and being able to tell if the equation is a function (linear, quadratic, cubic, etc.) or not by looking at which terms are squared, can anyone explain it to me?
4. When does an equation end up being graphed as a parabola?

that's pretty much it for now, thanks for any future replies.

*edited
Quote by Zeppelin08
I busted a nut because my g-string was too tight.




Quote by rexreeper99
Hendrix. he played jazz right? lol. im real bad with names.

i guess jazz could work




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Last edited by cactus at Sep 14, 2007,
#2
1. Dont know, probably something thats only studied in whatever country your from
2. the y intercept is anywhere where the line goes through the y axis (that line going up and down). Its the same with the x intercept, anywhere on that line going from left to right.
3. reword your question, that makes almost no sense
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#4
Dude, you can talk about a lot of things in the pit, from sex to your aunties cat....

But you can NEVER talk about maths or school work!!!
#5
well the vertical line test, is when you draw a straight line through the function. If the line that you drew intersects the function at any place more than once, it failed the test. I think that was how it went.
#7
1. What is the vertical line test? - if y = constant
2. What is the Y-intercept and X-intercept? - y int = when x=0, x int = when y = 0
3. There's this thing about looking at an equation and being able to tell if the equation is a function (linear, quadratic, cubic, etc.) or not by looking at which terms are squared, can anyone explain it to me? - erm.. what?
4. When does an equation end up being graphed as a parabola? - When y = something with x squared
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#8
Quote by FNAFJ
2. What is the Y-intercept and X-intercept? - y int = when x=0, x int = when y = 0
programmer?
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[U]        |/     .-.              [/U]
[U]       /|_     `-’       |      [/U]
[U]      //| \      |       |      [/U]
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      *-|-*    (_)     `-’
        |
        L.
#9
Quote by cactus
Hey guys, I'm studying right now for a test, and I would like to ask some things about graphing and the like, 'cause I don't understand the concepts too well;
1. What is the vertical line test?
2. What is the Y-intercept and X-intercept?
3. There's this thing about looking at an equation and being able to tell if the equation is a function (linear, quadratic, cubic, etc.) or not by looking at which terms are squared, can anyone explain it to me?
4. When does an equation end up being graphed as a parabola?

that's pretty much it for now, thanks for any future replies.

*edited


1. Tests whether or not a graph is a function - if a vertical line cuts more than once in any place it is not a function as one x value can be assigned multiple y values.
2. Y-intercept - where the graph cuts/touches the y axis, when x=0.
X-intercept is where the graph touches/cuts the x axis, when y=0.
3. Linear y=x
Quadratic y=x^2
Cubic y=x^3 etc.
You look at the x term with the highest power (the term is called the leading term; the power is called the degree)
E.g. y=x^3 + 2x - 7x^4 is a quartic equantion
5. When x has a square term and y does not, or when y has a square term and x does not. E.g. x^2 + x +y -3 =0 is a parabola (concave down) and y^2 + x = y is a parabola (going to the right). It is not a parabola if BOTH are squared (it is a circle or ellipse)
Quote by gflip69
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#10
so wait in reference to the the formula y = mx + b; "y" is equal to "b" since I equated "x" to zero?
Quote by Zeppelin08
I busted a nut because my g-string was too tight.




Quote by rexreeper99
Hendrix. he played jazz right? lol. im real bad with names.

i guess jazz could work




add me up http://profile.ultimate-guitar.com/cactus/
Last edited by cactus at Sep 14, 2007,
#11
Yes, b is the y-intercept.
Quote by gflip69
Someone called me on my landline (home phone) and asked me where I was.