• Area With Determinants - Problem 1

Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a triangle using a determinant.
• Rate Word Problems - Problem 6

Math›Algebra›Word Problems Using Systems of Equations
Solving a rate word problem where there are two travel rates
Tags:
• Percent Concentrations - Problem 3

Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about mixing two liquids with different percent concentrations and one of the ingredients is "pure."
• Square Matrices - Problem 3

Math›Precalculus›Systems of Linear Equations and Matrices
How to show that two matrices are inverses (in the sense of matrix multiplication).
• Area With Determinants - Problem 3

Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of an irregular quadrilateral using determinants.
• Sum of Digits - Problem 2

Math›Algebra›Word Problems Using Systems of Equations
How to solve a problem when asked to switch the digits of a 2-digit number and one digit is zero.
• Mixture Problems - Problem 1

Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems when mixing two quantities with different prices and the price of the mix is unknown.
• Simplifying Determinants - Concept

Math›Precalculus›Systems of Linear Equations and Matrices
How to simplify determinants using three row (or column) operations.
• Square Matrices - Problem 2

Math›Precalculus›Systems of Linear Equations and Matrices
How to interpret 2x2 matrices as transformations.
• Percent Concentrations - Problem 1

Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about mixing two liquids with different percent concentrations and the quantity of one ingredient is unknown.
• Work Word Problems - Problem 3

Math›Algebra›Word Problems Using Systems of Equations
Algorithm for solving "work" word problems including shared job and individual job completion times
Tags:
• Age Word Problems - Problem 3

Math›Algebra›Word Problems Using Systems of Equations
Techniques for solving word problems that involve changing relative ages
Tags:
• Area With Determinants - Problem 2

Math›Precalculus›Systems of Linear Equations and Matrices
How to use the triangle area formula to test three points for collinearity.
• The Inverse of a Square Matrix - Problem 3

Math›Precalculus›Systems of Linear Equations and Matrices
How to find the inverse of a square matrix of order 3 using row operations.
• Mixture Problems - Problem 2

Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems when mixing two quantities with different prices and the amount of one ingredient is unknown.
• The Inverse of a Square Matrix - Problem 2

Math›Precalculus›Systems of Linear Equations and Matrices
How to determine that a matrix has no inverse using row operations.
• Invertible Square Matrices and Determinants - Concept

Math›Precalculus›Systems of Linear Equations and Matrices
How to determine whether a square matrix is invertible using its determinant.
• Sum of Digits - Problem 1

Math›Algebra›Word Problems Using Systems of Equations
How to solve a problem when asked to switch the digits of a 2-digit number and the result is more than the original.
• Area With the Cross Product - Problem 1

Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a parallelogram using the cross product of the vectors that determine it.
• Percent Concentrations - Problem 2

Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about mixing two liquids with different percent concentrations and the concentration of the mixture is unknown.