Which of these relations is a function?
Four graphs on coordinate planes; top left shows a circle, top right an ellipse, bottom left a step function with open and closed points, bottom right a line with a break and open points.
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Four graphs on coordinate planes; top left shows a circle, top right an ellipse, bottom left a step function with open and closed points, bottom right a line with a break and open points.
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(view all functions vertical line test worksheet)