according to the graph what is the value of the constant in the equation below

The value that represents the constant in the equation of the linear graph is calculated as: B. 2.5.
The constant of a linear graph, is the slope of the line = change in y / change in x.
Using any of the two points on the line, (2, 5) and (4, 10):
Constant/slope = (10 - 5)/(4 - 2)
Constant/slope = (5)/(2)
Constant/slope = 2.5
The constant is: B. 2.5.
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