http://www.ck12.org Chapter 8. Systems and Matrices
Then type in the appropriate operation and see the result. The TI-84 has a built in Transpose button.
The actual numbers on this guided practice are less important than the knowledge that your calculator can perform
all of the matrix algebra demonstrated in this concept. It is useful to fully know the capabilities of the tools at your
disposal, but it should not replace knowing why the calculator does what it does.
- The matrix simplifies to become:
[cos 90◦ sin 90◦
−sin 90 cos 90]
=
[ 0 1
−1 0
]
When applied to each point as a transformation, a new point is produced. Note that[x y]is a matrix representing
each original point and[x′ y′]is the new point. Thex′is read as “xprime” and is a common way to refer to a
result after a transformation.
[x y]·[ 0 1
−1 0]
=[x′ y′]
[0 0]·[ 0 1
−1 0