standard_description: Understand that, unlike multiplication of numbers, matrix multiplication for square matrices is not a commutative operation, but still satisfies the associative and distributive properties.
problem_activity: Use the coordinate plane below for Parts (a) and (b).
[IMG]
a.   Draw a line through points
M
and
N
.
b.   Draw a second line that is perpendicular to
$$\overleftrightarrow{MN}$$
.


aligns: no