WeBWorK Standalone Renderer

Determine if each graph defines $\small{y}$ as a function of $\small{x}$ .

(click on each image to enlarge)

(a) (b) (c) (d)
$\quad$ $\qquad\qquad\;$ $\qquad\qquad\;$ $\qquad\qquad\;$

You can earn partial credit on this problem.