algebra II

charles:

what is the answer to

write an exponentional function y= ab to the x power for a graph that includes the given points
(-1,12.5),(4,4.096)

(x, y)
y=a*b^x

[input]solve( 12.5 = a*b^-1 ,4.096=a*b^4 )[/input]

for example:
a=10
b=4/5
y=10*(4/5)^x

[input]plot( 10*(4/5)^x, x=-1..4 )[/input]