Determinants and Cramer's Rule

Question 1

What is a Determinant?

Answer 1

An associated value that every square matrix has.

Question 2

How do you find a Determinant?

Answer 2

You multiply diagonally and subtract.

Question 3

What is Cramer’s Rule for Two Equations?

Answer 3

ax+by=c
ax2+by2=c2

x= | c b |
| c2 b2 |
————
D

y= | a c |
| a2 c2 |
————
D

Question 4

How do you find the Determiner of a 3x3 Matrix?

Answer 4

You copy the first two columns and put them on the side, then you multiply diagonally in both directions, and finally you add up all of the diagonals going one way and subtract the diagonals going the other way.