The linear function that represents this graph is given by:
y = 300 - 0.6667x.
A linear function is modeled by:
y = mx + b
In which:
From the graph, when x = 0, y = 300, hence the y-intercept is of b = 300. The amount decays to 0 when the x-intercept is of x = 450, hence the slope is given by:
m = -300/450 = -0.6667.
Which means that the equation is:
y = 300 - 0.6667x.
More can be learned about linear functions at https://brainly.com/question/24808124
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