Rational numbers & Equivalent fractions

How many equivalent fractions does any rational number have?[br][br]All of the fractions equivalent to the rational number p/q line on the line y = (p/q)x. [br][br]The point {0,0} lies on all lines of the form y = (p/q)x. Does this mean that the "fraction" 0/0 is equivalent to all rational numbers? How can and/or do you make sense of this?[br][br][color=#ff0000][i][b]What questions could/would you pose to your students based on this applet?[/b][/i][/color]

Information: Rational numbers & Equivalent fractions