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Find $A$ and $b$, each correct to 2 decimal places.
Mathematics 9709 · AS & A Level · Logarithmic and exponential functions
Logarithmic and exponential functions — practice question
The variables $x$ and $y$ are linked by $y = A b^{-x}$, with $A$ and $b$ as constants. As illustrated, the graph of $\ln y$ against $x$ is a straight line that goes through the points $(1, 2.9)$ and $(3.5, 1.4)$.