Decide whether each graph below is a function. If it’s not, prove it by drawing a vertical line that crosses the plot at more than one point.

v-shaped graph. opens to the left

scatter plot. 2 sets of points share the same x value

diagonal line sloping downward

Function or Not a Function?

Function or Not a Function?

Function or Not a Function?

graph of a curve swooping down from the left and out to the right

u-shaped graph opening downward

vertical line

Function or Not a Function?

Function or Not a Function?

Function or Not a Function?

u-shaped graph opening to the right

graph of a curve from the bottom left to the top right

graph of a circle

Function or Not a Function?

Function or Not a Function?

Function or Not a Function?

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