If a system of two equations has exactly one solution, then the lines representing these two
equations: ___________.
Fill in the blank(s) with correct word
Question 2
Which of the following figures is mapped onto itself by a 90 rotation around the point of
intersection of its diagonals?
(a) a rhombus.
(b) a rectangle.
(c) A parallelogram.
(d) A pentagon.
(e) None of these is correct.