These graphs show how the current through a component changes as you change the voltage across it. To find the resistance, you would use the previous equation and find the voltage and current from the graph.
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Graph Slope
Indicates resistance; steeper slope means higher resistance.
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Examples - 1
Filament lamp - This would show a stretched, S-like curve. This is because the temperature is not constant - increasing the voltage would increase the temperature, which in turn increases the resistance. This is what makes it curved.
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Examples - 2
Resistors and Wires - The temperature on these is constant, meaning the curve would be straight.