book Maths Puzzle Numerical Ability

inverse of g(x)=3^x+1
i get to the point of were i have the equation

x-1=3^y but i dont know how to get the y isolated on one side

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book Other Question

one glass contains 10 ounces of orange juice and a second glass contains the same amount of lemon juice. A dipper of the first is ladled into the second and throughly mixed. Then a I can't seem to get the answer to this problem.

r=-0.08p^2+300p

Factor out the price on the right hand side of the formula