If all linear relationships can be shown as points on a graph, does that mean all graphs are linear?

Beneath each graph circle Linear or Not Linear.

upside-down v-shaped graph with its vertex at the origin

two curves: one rounds down from (-7.5, 2.75) to the origin and the other curves up from the origin to (7.5, 2.75)

1 Linear or Not Linear?

2 Linear or Not Linear?

3 Linear or Not Linear?

a diagonal line, sloping downward from left to right

a diagonal line, sloping updward from left to right

a u-shaped graph, opening upward, with its vertex at the origin

4 Linear or Not Linear?

5 Linear or Not Linear?

6 Linear or Not Linear?

What do you Notice? What do you Wonder?

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