Question: Resolving a system with initial conditions on x,y, x' and y'



I'm trying to resolve a problem in physics (movement of a particle in a magnetic field) and plot it. I need initial conditions on both (x,y) and (x',y') but when I'm trying to put the four conditions in the initial list of DEplot, a mysterious mistake arises :


Error, (in dsolve/numeric/process_input) invalid specification of initial conditions, got {0 = 0, 0 = 1}


But here is my worksheet :






What should I do to solve this problem ? I've copied the line for DEplot from the help page, but I haven't seen in there a possible solution to my problem.


Thanks in advance if you can help me !

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