Answer:
y = 1 * 4^x
Explanation:
the parental function of an exponential equation is y = ab^x
a is the initial y or the y intercept
b is the multiplier
so since the y intercept is a so far the equation is y = 1 * b^x
as stated above the multiplier is 4
that means the b is four
the equation is y = 1 * 4^x