Hi everyone, I'm having trouble with these questions and I'm not sure how to do them/where to start. Does anyone have a solution to it? It will help me with my future problems on this topic!

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.