Mr Wilkinson invests £3000 at a compound interest rate of 2.2% per annum. He wants his investment to earn more than £800 interest.
Work out the least time, in years, that it will take.​

logv3(x+2)=1

rewrite in exponential form:

logb(x) = y is equal to b^y =x

b = 3, y = 1

now solve for x:

3^1 = x+2)

x = 3-2

x = 1

see the picture for the graph.

you can't solve x because it is 2 linear equation and you only have one equation