Ask students to line up along the line at the middle of a basketball court, which will be the x-axis. The middle student will be 0, and students on the right will be 1, 2, 3, etc., while students on the left will be -1, -2, -3, etc. Then, say

"y = 3, everyone takes 3 steps forward"These initial two maneuvers should help students coordinate with their neighbors, so that they end up on a line parallel to the x-axis with each.

"Go back to the x-axis"

"y = -2, everyone takes 2 steps backward"

"Go back to the x-axis"

Now say

"y = 2x, everyone step 2 times your number -- forward or back, depending on whether 2 times your number is positive or negative!"Presumably, students will be standing on the graph of y = 2x.

And so on, with different functions.

--Henri

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