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Browse High School Equations, Graphs, Translations
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Direct and indirect variation.
    Slope, slope-intercept, standard form.

Lagrange Polynomial Interpolation [08/08/1997]
Please give me the definition and a brief example of how it works.

Lattice Points and Boundary Lattice Points [08/30/1998]
What is an interior lattice point and a boundary lattice point of a given shape (triangle, circle, rectangle, etc.)?

Linear Equations and Standard Form [04/04/2002]
What do the variables mean in the standard form of a linear equation (ax+by=c)?

Line Crossing Horizontal and Vertical Asymptotes [03/16/1999]
For the function y = (5x+1)/(x^2-1), why does the line between its two vertical asymptotes and one horizontal asymptote cross?

Line Dividing a Plane [05/11/2001]
Given a square (graphed on the Cartesian coordinate system) and a point in the square, draw a line through the point that will divide the square into two regions: one the smallest area possible, the other the largest possible.

Line of Best Fit [8/1/1996]
Are a best-fit line, a line of best fit, and a fitted line synonymous?

Lines and t-tables [11/09/1996]
How do you use t-tables to graph lines?

Lines Partitioning a Plane [03/09/1998]
Into how many disjoint regions do n coplanar lines partition the plane?

Lines Tangent to a Hyperbola [07/14/1998]
If y = 2x + k is a line tangent to the graph x^2 + y^2 = 1, what is k?

Locus of the Midpoint of a Chord [03/13/1998]
Show that the locus of the midpoint of the chord is a hyperbola.

Manipulating Roots [08/08/1998]
If a and b are the roots of the equation 3x^2 - 5x + 1 = 0, find the equation whose roots are a/b and b/a.

Mapping 3D Line Segments [10/06/1997]
How do I map 3D line segments onto a 2D perspective as seen from an arbitrary point in space?

Minimum Distance [02/07/1998]
What is the minimum possible distance between a point on the graph of x^2+y^2 = 1 and a point on the graph of xy = 1?

More Questions on Finding the Equation of a Circle [10/1/1995]
Find the equation of the circle containing the points (-1, -2) and (6,-1) and touching the x-axis.

Moving a Circle on a Polar Graph [05/04/2001]
How do you move a circle so the center is not (0,0), but to where the center can be (r,[theta])?

Multiplying or Dividing by a Negative Number [04/08/1999]
When x(x-4) is less than 0...

Naming and Graphing Functions [06/16/1997]
Can you tell me about the different families of functions?

Non-parallel Glide Reflections [10/21/1998]
A glide reflection consists of a line reflection and a translation parallel to the reflection. What if the translation is not parallel to the reflection?

Oblique Asymptote [4/13/1996]
I have a question about the oblique asymptote of the function: F( X ) = ( X^3 - 3X^2 + 2X - 8 ) / ( X^2 + 4X + 4 )...

Oblique Asymptotes [04/03/2002]
I'm stuck on how to calculate oblique limits, for example, x^2/(x-3).

Order of Quadrant Numbers [10/21/2002]
Why are quadrants numbered that way?

Parabola [12/23/1997]
Find the vertex, axis of symmetry, directrix, focus, distance from the vertex to the focus, and the latus rectum.

Parabola Equation [5/15/1995]
I'm trying to learn equations of parabolas. The example given is: find the equation of the parabola with vertex (0,0) and focus (0,-3)...

Parabola Equations [05/12/1997]
Deriving the standard equation for a parabola from its focus and directrix; manipulating this equation to change the graph's appearance.

Parabola Focal Point [7/3/1996]
What are the rules for the focal point of a parabola?

Parabola Problems [2/23/1997]
A culvert is shaped like a parabola, 18 centimeters across the top and 12 centimeters deep. How wide is the culvert 8 centimeters from the top?

Parabolas Through Pairs of Points [07/13/2002]
Can infinitely many parabolas pass through any two points in a plane?

Parabola with Horizontal or Vertical Axis [05/03/2001]
How can I find the focus and directrix of a parabola whose axis is either horizontal or vertical, like 2x^2 = -y?

Parabolic Equation of an Arch [05/25/1998]
Finding the equation of the parabola in the McDonald's golden arches.

Parametric Equations [07/21/1998]
A curve is given parametrically by the equations: x = (3-2k)^2 and y = (2+k)^2. Find dy/dx, the x-intercept, the cartesian equation...

Perpendicular Distance [04/10/1998]
Prove that the distance from a line ax + by + c = 0 to the point (h,k) is (a*h + b*k + c)/(a^2+b^2)^(1/2).

Piecewise Function [10/23/2001]
How do you graph the piecewise function?

Piecewise Functions on TI Graphing Calculators [02/08/2005]
I was wondering if you could tell me how to graph a piecewise function on a TI-83 plus graphing calculator?

Piecewise Notation and Absolute Value [9/9/1996]
How do I use piecewise notation to write x in terms of y for "y=2x+ abs(2-x)"?

Point Contained by a Circle [8/8/1995]
How can I tell if an arbitrary point on a plane is contained by a circle?

Point inside a Triangle [07/15/2001]
Given four points, three of them the corners of a triangle, is there a formula to determine whether or not the fourth is inside the triangle?

Point Inside or Outside Triangle? [08/02/2001]
I have coordinates of three vertices of the triangle and coordinates of the point.

Point on a Line [03/23/2001]
Can you please tell me a formula to find if a point exists on a line? Both are in x,y form.

Points Equidistant from Point and Line [08/30/2001]
I have to plot as many points equidistant from a point and a line as possible, and join them to get the locus.

Points Where a Parametric Equation Crosses Itself [10/12/2001]
Find all the points where the function of the parametric equation: x= t(9-t^2) and y=(t^2-1)(t^2-9) crosses itself...

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