Zane is a dangerous fellow who likes to go rock climbing in active volcanoes. One time, when he was 20 meters
below the edge of a volcano, he heard some rumbling, so
he decided to climb up out of there as quickly as he could.
He managed to climb up 4 meters each second and get
out of the volcano safely.
Graph the relationship between Zane's elevation relative
to the edge of the volcano (in meters) and time (in
seconds)