Matrices Flashcards
1
Q
what is the identity matrix and why is it important
A
1 0
0 1
when multiplying it doesn’t change the value of the matrix
2
Q
what is the matrix for: enlargement by scale factor a from the origin
A
a 0
0 a
3
Q
what is the order of a matrix
A
no. rows x columns
4
Q
how do you know if matrices can be multiplied together
A
if the number of columns in the first is equal to the number of rows in the second
5
Q
how to do combined transformations (two)
A
6
Q
reflection in the y axis
A
-1 0
0 1
7
Q
reflection in the x axis
A
1 0
0 -1
