algebra
posted by Viggo .
How do you do this:
Write an exponential function of the form y=ab^x that has a graph through (2, 25) and (1, 10).
This is what I have so far:
10=ab^1
10/b=a
y=10/b*b^x
2/25=10b^3
.008=b^3
Then I am stuck. Am I doing it right so far? How do I continue? Thanks!
I don't get your second last line, I had:
25 = (10/b)b^2
2.5 = b^3
0.4 = b^3
b=cuberoot(.4)=.7368...
then a=10/.7368... = 13.572..
so y = 13.572(.7368)^x
I checked both data values, they work
gotcha thanks
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