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Browse High School Linear Algebra
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Vector questions.
 Matrix Algebra [06/01/1998]

Solving for X in the matrix product A*X  X*B = C.
 Matrix Division? [06/26/2006]

Is it possible to divide matrices?
 Matrix Encoder and Decoder [07/22/2003]

How does the decoder work?
 Matrix Inverses [04/07/1998]

Can you find a 2x2 matrix A such that A^2 = I? Can you find a 2x2 matrix
that has no inverse?
 Matrix Multiplication [09/04/1997]

I am doing a project in Algebra 2 and must research matrix
multiplication.
 Matrix Multiplication [12/18/1998]

Why does matrix multiplication work? Why are the rows multiplied and
added with the columns?
 Matrix Multiplication [10/11/2003]

I'm trying to multiply two matrices. I know what the dimensions of
the product have to be, but how do I do the actual multiplication?
 Matrix Questions: Addition, Inverse [8/6/1996]

(1 2) + (1 2) =? and if A = (3 4), does A inverse exist?
 Matrix Rank [09/29/2001]

I want to find the rank of a matrix, but I don't know how to compute
rank.
 Matrix: Why Use m and n? [09/06/2001]

Why do we use m and n, with x between them, to represent order in a
matrix?
 Matrix with No Inverse [06/13/2005]

Are there are 3x3 matrices that do not have inverses? If so, can you
give me an example?
 Maximum Difference, Longitude and Latitude [04/10/2001]

Find the maximum longitude and latitude difference between two points on
Earth 1000 kilometers apart.
 Minimum Matrix Multiplication [02/16/2003]

Find a way to multiply n matrices using a minimum number of
multiplications of the entities.
 More on the Intersection of Two Lines in Three Dimensions [02/17/2009]

How to isolate for "a" in the vector equation a(V1 x V2) = (P2  P1) x
V2, with a suggestion for computer coding.
 Multiplicative Inverse in Finite Field GF(2^8) [02/23/2005]

Is the multiplicative inverse of a 4x4 matrix in GF(2^8) the same as
the inverse of any 4x4 matrix?
 Multiplying a Matrix By a Scalar [08/27/1998]

When you multiply a scaler times a matrix, the result is a new matrix...
 Multiplying Matrices and Identifying Dimensionality [07/16/2003]

I understand adding and subtracting matrices, but not multiplying
them. Also, how can I find the dimensionality of the following
matrix...?
 Natural Numbers Coprime to 6 [02/16/1998]

Let N(x) denote the number of natural numbers less than x which are
coprime to 6. Show that lim as x goes to infinity of [N(x)/x] = 1/3.
 Nearest Point on a Great Circle [05/27/2002]

Given points A, B, and C on the surface of a unit sphere, find the
point P on the great circle defined by A and B that is nearest to C.
 Pane Rotation  Computer Graphics [11/14/1996]

How do I find a formula for rotating a pane in space?
 Parallelepipeds [05/06/1997]

What is the formula for finding the total surface area of a
parallelepiped?
 Parametrics [12/18/1996]

You're in 3D space at point A, you want to get to point B, and you know
the coordinates to point B from point C (but B is moving). What heading
do you need to set in order to meet point B?
 Point Inside or Outside Triangle? [08/02/2001]

I have coordinates of three vertices of the triangle and coordinates of
the point.
 Point within a Triangle [05/29/2003]

I have the coordinates of the three corners of a equilateral triangle
ABC. How can I decide whether an arbitrary point (X,Y) lies in the
plane of the triangle?
 Powers of Matrices [6/27/1996]

Would you send me some information/links about matrices and exponentials?
 Principal Axis Theorem [12/10/1997]

Could you give me applications of the principal axis theorem?
 Product of Upper Triangular Matrices [09/23/2003]

Show that the product of two upper triangular matrices is an upper
triangular matrix.
 Proof About Matrices [06/02/1999]

How do I prove that in two 2 x 2 matrices, A and B, AB  BA will never be
the multiplication identity matrix?
 Properties of Determinants [10/23/2000]

What properties of determinants do we use to evaluate them, and how? How
do we put determinants in rowechelon form?
 Prove Choice of Scalars Unique [03/13/2001]

Suppose B = {v1,v2, ... vn} is a basis for a vector space V. Let u
element of V be any vector. Prove that the expression of u in terms of
the basis B is unique.
 Raytrace of a Star Sapphire [12/11/1996]

How do I find the rotations necessary to create a raytrace of a star
sapphire so that the star always faces the camera?
 Rearranging Matrices [11/5/1995]

My problem involves matrices, specifically 9x9 size. I would like to know
how to determine what order to rearrange the rows so the numbers in the
diagonal add up to the maximum possible value.
 Redundant Sets of Equations [02/07/1997]

Is there a solution to the set consisting of these three equations: x + y
+ z = 50, 2x + 3y + 4z = 158, and 4x + 3y + 2z = 142?
 A ReFraming Inversion: Transforming the Coordinates in Between [03/27/2012]

Given some function that pass through (0, 0) and (1, 1), a student struggles to invert it
after zooming in on two inbetween points and recentering on them as the new origin
and (1, 1). Doctor Peterson obliges, starting with a sketch and simpler labels.
 Rotación de Véctores (3D Vector Rotation) [6/19/1996]

Hay alguna fórmula para rotar véctores en el espacio sobre
los tres ejes de coordenadas?
 Rotating a cube in space [12/5/1994]

I am a high school teacher, with a student interested in writing a
program to show a cube on the screen and then rotate it by moving the
corners around. He has asked me for equations. I don't have any. Do you?
 Rotating a Plane about a Point in Space [07/03/2004]

Discussion of a method of rotating the three points of a right
triangle around a point to align with a given plane in a particular way.
 Rotation Matrix about a Point Other Than the Origin [12/18/2006]

I know that in order to rotate a point around the origin you use the
rotation matrix with sine and cosine. I was wondering how you rotate a
point around a point other than the origin?
 Rotation Matrix Using Trig Functions [12/15/2005]

I know what the rotation matrix is for an angle of rotation of theta,
but I don't understand why it works.
 Rotations in Three Dimensions [11/11/1999]

How can I rotate something about an axis or about a line in 3D?
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