Question 72913
Write an exponential function of the form y=ab^x whose graph passes through the given points. 
 (1,4),(2,12)
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The form is y = ab^x
12 = ab^2
4  = ab^1
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Divide the 1st by the 2nd to get:
3 = b
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Substitute that into the 2nd equation to solve for "a":
4 = a*3^1
a=(4/3)
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EQUATION:
y = (4/3)*2^x
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Cheers,
Stan H.