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Hello!

We know that

the equation for calculating the slope of a line is

m=(y2-y1)/(x2-x1)

look for any two points on the graph

let

A(0,0)

B(3,1)

m=(1-0)/(3-0)> m=1/3

the slope  is 1/3 throughout the line

therefore  

the answer is the option

B-It is 1/3 throughout the line

Step-by-step explanation:

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- Anna♥