Brian is incorrect because the rate of change is change in y over change in x. Soimone is correct because the initial value and y-intercept are the same thing.
A linear equation is in the form:
y = mx + b
where y, x are variables, m is the rate of change (slope) and b is the y intercept (initial value of y)
The rate of change (m) = (change in y)/(change in x).
Brian is incorrect because the rate of change is change in y over change in x. Soimone is correct because the initial value and y-intercept are the same thing.
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