exam Maths Puzzle Numerical Ability

The function y=3^x has been transformed to y=2*3(^-1/2x-1) +8. What is the mapping rule for the image of y=3^x??? I think the answer is (x,y)--(-2x+1,1/2y-8)??????? Can someone ple

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Divide. Write your answer in lowest terms.
6t/5w divided by 9tw/w The graph of the function f(x)=mx+b contains the points (r,8) and (2,s). Express s in terms of r if the graph is parrallel to the line 2x+7y=22.