#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

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

*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

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

#3

http://www.mathwords.com/v/vertical_line_test.htm

Should answer question 1 and part of question 3

If a parabola is X^2 the lines go up

if it is -X^2 the lines go down.

Should answer question 1 and part of question 3

If a parabola is X^2 the lines go up

if it is -X^2 the lines go down.

#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!!!

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.

#6

i think the veritcal line test is when if you draw a line down a graph and the line cuts it once - its a function. if it cuts it more than once - its a relation

#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*

#8

programmer?2. What is the Y-intercept and X-intercept?-y int = when x=0, x int = when y = 0

#9

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)

#10

so wait in reference to the the formula y = mx + b; "y" is equal to "b" since I equated "x" to zero?

*Last edited by cactus at Sep 14, 2007,*

#11

Yes, b is the y-intercept.