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Selected answers to common questions:
Direct and indirect variation.
Slope, slope-intercept, standard form.
- Cubic Polynomial [6/27/1996]
Show that the graph of every cubic polynomial has a point of symmetry.
- Curve Fitting [03/08/1997]
I need help writing an algorithm that fits a curve to a given set of data
- Decimal to Polar Coordinates [11/23/1997]
I need to know how to convert from rectangular coordinates back to polar.
- Definition of a Cone [07/13/2000]
I don't see how a right circular cone cut parallel to the axis of
symmetry reveals a hyperbola. Shouldn't it be a parabola?
- Definition of a Parabola [2/23/1997]
Suppose that (x, y) is to be on the parabola. Suppose that the line
mentioned in the definition is given by x = -p. Find the distance between
(x, y) and the line...
- Definitions of Advanced Concepts [11/13/1998]
Can you give me definitions for: Pythagorean Triplets, Principle of
Duality, Euclid's Elements, Cycloid, Fermat's Last Theorem?
- Degenerate Conics [03/04/1998]
Identifying the degenerate cases for the graphs of equations in conic
- Deriving the Hyperbola Formula [04/27/1998]
When speaking of hyperbolas, why does C^2 = A^2 + B^2?
- Deriving the Quadratic Formula [10/15/1998]
How do you derive the quadratic formula from ax^2 + bx + c = 0?
- Descartes' Method for Tangents [09/02/1998]
Can you help me find the equation of the tangent of y^2 = 2x using
- Describing the Graph of an Equation [1/27/1996]
Which of the following is true of the graph of the equation: y = 2x^2 -
5x + 3 ?...
- Determining Linear Relations [04/22/1998]
Given a set of points on a plane, how can you tell if the relation
between them is linear, quadratic, cubic, or exponential?
- Determining Slope [05/19/1999]
How do I find the slope of a line given the coordinates of two points?
- Determining Tangent to an Ellipse, Minimizing Area [02/20/1998]
Find the equation of the tangent to the ellipse that forms, with the
coordinate axes, the triangle of smallest possible area.
- Determining Whether a Function is Continuous [06/10/2000]
How can you tell whether or not a function is continuous?
- Difference Quotient Function [09/06/1997]
Find the equation of the line tangent to a curve f(x) = x^3 - 7x^2 + 12x
+ 2 at the point (3,2) without using calculus.
- Dilations of the Graph of y = f(x) [08/22/2004]
If y = 2f(x) stretches y = f(x) vertically by a factor of 2, why does
y = f(2x) shrink it horizontally by a factor of 2? The notation seems
- Direct and Indirect Variation [07/09/1998]
Can you explain the difference between direct and indirect variation? How
would you interpret them in a word problem?
- Direct/Indirect Variation [6/12/1996]
Please explain direct and indirect variation.
- Domain of a Function [9/13/1996]
What is the domain of f(x)= x/sqrt(x^2-4)?
- Domain, Range, and Asymptote [10/12/1998]
How do you find the domain, range, and asymptote of a function?
- Domain, Range, and Translating Functions [06/29/2004]
Given the graph of y = f(x), domain [-4,3], range [-2,3], sketch other
functions, such as y = |f(x)| and y = f(x - 2), and find the domain
and range of each.
- Domain/Range of a Function [01/22/1997]
How do you find the domain and range of the function f(x) = 2x^2-3x+1?
(Both with and without calculus.)
- Drawing a Line, Given the Slope and One Point [05/23/2002]
How do I draw a line on a graph when I know the slope and the
location of only one point on the line?
- Drawing Spirals on Your Computer [9/5/1995]
I want to draw spirals with the computer. I don't know how. Could you
send me formula(s) I can use to do it?
- Ellipse Equation [03/11/1999]
How do I get the equation of an ellipse, given four points and the
inclination of the major axis?
- An Ellipse Or A Circle? - Parametric Equations [12/05/1998]
Is this parametric equation elliptical or a circle?... And how do I
compute the slopes at points 0, pi/4, pi/2, 3pi/2,and 2pi?
- Equation for an Ellipse [10/27/1995]
I found the right formula for a circle but can't find it for an ellipse.
- Equation for a Vertical Line [8/29/1996]
What is equation for a vertical line passing through (7, -10)?
- Equation for a W-Shaped Graph [08/01/1999]
What sort of equation has a graph that is shaped like a 'W'?
- Equation in Slope Intercept or Point Slope Form [03/16/2002]
Find an equation of the line with slope -4/3 and y-intercept 3. Leave the
equation in slope intercept form....
- The Equation of a Cone [9/13/1995]
I would like to know the equation of a cone. Could you help me?
- Equation of a Line [01/27/1998]
How do I find the equation of a line through origin perpendicular to 2x +
3y = 5?
- Equation of a Line in Point-Slope, Slope-Intercept, General Form [8/2/1996]
What is the equation of the line that contains the point (4, -4) and is
perpendicular to the line defined by 2x-5y+3 = 0?
- Equation of a Parabola [03/04/1997]
Determine the equation of a parabola given its vertex and either the
equation of the directrix or the coordinates of the focus.
- Equation of a Parabola [12/20/2001]
Given several points that appear to be a parabola, how do you approximate
the equation that would give a similar graph?
- Equation of a Sphere [7/3/1995]
What is the equation for a sphere on a graph with the dimensions x,
y, and z?
- Equation of Parabola with Given Vertex, Point [8/4/1996]
How do I find the equations for all parabolas containing the origin whose
vertex is at (2,1)?
- Equations that Meet on a Graph [03/09/2002]
Graph d = 30t and d = 28t+12 (d is distance and t is time).
- Equations with Two Variables [03/25/1998]
Identify and find solutions to systems of equations or inequalities by