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

1 Function or Not a Function?

2 Function or Not a Function?

3 Function or Not a Function?

graph of a curve undulating up and down from left to right

graph of a curved that swoops from the bottom left to the right

graph of an ellipse

4 Function or Not a Function?

5 Function or Not a Function?

6 Function or Not a Function?

u-shaped graph that opens to the left

scatter plot. 2 points share the same y-value

horizontal line

7 Function or Not a Function?

8 Function or Not a Function?

9 Function or Not a Function?

squiggly graph kind of like the letter w

graph of a curve swooping down from the right and looping back around to the top right

v-shaped graph: opens upward

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