# Matrices

# Algebra II Terms

## Get down with the lingo

### Cramer's Rule

This rule is a way to solve square systems using determinants.### Determinant

Determinants ditch the brackets and use vertical lines instead. You can only find a determinant for a square matrix. Example: or### Entries

Entries are the numbers or variables inside the brackets. In the example for the term "Matrix" the entries are 2, 4, -3, 1, -7, and 41.### Matrix

Variables or constants arranged like a grid in rows and columns that together make up a rectangle. The**rows**go across ( "2 4 -3" in the first example below is a row) and the

**columns**are vertical (in the same example below "2 1" is a column); they're like the columns in the Lincoln Memorial. Examples: A 2 × 3, a 2 × 2 and a 4 × 1, in that order: