standard_description: Understand that the zero and identity matrices play a role in matrix addition and multiplication similar to the role of 0 and 1 in the real numbers. The determinant of a square matrix is nonzero if and only if the matrix has a multiplicative inverse.
problem_activity: Label the second quadrant on the coordinate plane, and then answer the following questions.
[IMG]
a.   Write the coordinates of one point that lies in the second quadrant of the coordinate plane.
b.    What must be true about the coordinates of any point that lies in the second quadrant?
c.    Plot and label the following points:
$${A: (-4, 6)}$$
$${B: (6, -4)}$$
$${C: (0, -2)}$$
$${D: (2, 0)}$$
$${E: (-5, -3)}$$


aligns: no