Find the Equation for the Exponential Function That Passes Through $( 2,4 )$

Short Answer

Find the equation for the exponential function that passes through the pair of points $( 2,4 )$ and $( 7,1 )$ .
​ $y = A b ^ { x } ( b > 0 )$ ​
A = __________
​
b = __________
​
Round your answer to four decimal places.