Match the graph of the function with the function rule

As seen from the graph, the y intercept is (0,0.5)
plugging this value in each equation:
y=1*4^x
plugging x as 0 and y as 0.5
lhs≠rhs
[tex] y=\frac{1}{4} *4^{x} [/tex]
plugging x as 0 and y as 0.5
lhs≠rhs
[tex] y=\frac{1}{2} * 4^{x} [/tex]
plugging x as 0 and y as 0.5
lhs = rhs
so answer is [tex] y=\frac{1}{2} * 4^{x} [/tex]