4.12.2 Greatest hits from previous weeks

4.12.2.1 1 Plot, 2 Scale/Axis

http://mathematica.stackexchange.com/questions/627/1-plot-2-scale-axis

 
 
 
I would like to plot those two datasets on top of each other. But they have very different range on the $y$ axis. How can I have two different axis? 
 
I found the following on the help menu but quite  ...
 

- asked by 500 (114 votes), answered by ArgentoSapiens (110 votes)

4.12.2.2 Assign the results from a Solve to variable(s)

http://mathematica.stackexchange.com/questions/6669/assign-the-results-from-a-solve-to-variables

 
I understand Mathematica can't assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables?
 

- asked by stevenvh (34 votes), answered by Artes (25 votes)