You have the following function:
f(x) = 2(1/5)ˣ
IN order to find the y-intercept of the previos function, make x = 0:
f(0) = 2(1/5)⁰
f(0) = 2(1)
f(0) = 2
Hence, the y-intercept of f(x) is f(0) = 2