3.7

Question 1

How to find determinant

Answer 1

All downs (multiplied then added) minus all the ups (multipled then added)

Question 2

Are of a triangle

Answer 2

All x’s then y’s then one’s,

Find determinant and multiply by +- 1/2

Question 3

Camera rule

Answer 3

Find overall determinant, Variable equals matrix equation with variable part substituted with constants, find determinant of that and divide by overall determinant

Question 4

Identity matrix

Answer 4

All ones diagonal right, with zeros for the rest

Question 5

How to find inverse matrix

Answer 5

Find determinant, then 1/determinant multiplied by the matrix with switched and flipped numbers

Question 6

If Ax=B

, how do you find X

Answer 6

X=A-1(B)

Question 7

How to find determinant with calculator

Answer 7

2nd
X-1
Edit then math det

Question 8

How to find area of a triangle using determinant/ matrices

Answer 8

Plus or minus 1/2 (to make area positive) multipled by the determinant of a matrix of all the x values, all the y values and then all ones