Question 549870
How do I make the equation y=ab^x with two points, 
(5,4) and (7,9)?
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Solve for a and b:
Using (7,9) you get 9 = ab^7
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Using (5,4) you get 4 = ab^5
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Divide the lower into the higher equation:
(9/4) = b^2
b = 3/2
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Substitute for "b" and solve for "a":
9 = ab^7
9 = a(3/2)^7
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a = 9/(3/2)^7 = 0.5267
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Equation:
y = (0.5267)(3/2)^x
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Cheers,
Stan H.
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