(a) If a graph is symmetric with respect to the $x$ -axis and $(a, b)$ is on the graph, then (_____, _____) is also on the graph.
(b) If a graph is symmetric with respect to the $y$ -axis and $(a, b)$ is on the graph, then (_____, _____) is also on the graph.
(c) If a graph is symmetric about the origin and $(a, b)$ is on the graph, then (_____, _____) is also on the graph.