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The equation of slope of the graph is,
[tex]Slope=\frac{y_2-y_1}{x_2-x_1}[/tex]Consider,
[tex]x_1=2,x_2=4,y_1=9,y_2=13[/tex]Then,
[tex]\text{Slope =}\frac{13-9}{4-2}=2[/tex]Therefore, the correct option is A