Practice problem
Which of the following functions has a discrete graph?
y=xy=xy=x, as xxx varies over the real numbers
y=x2y=x^2y=x2, with every real number xxx allowed as input
y=1xy = \frac{1}{x}y=x1, with every nonzero real x≠0x\neq0x=0 allowed as input
None of the above
Type a concept, like “slope” or “photosynthesis”.
