this is all the question came with HELP balance the followin

this is all the question came with!! HELP!! balance the following redox reaction in acidic solution:
Cu^2+ (aq) + HNO2 (aq) = Cu^2+ (aq) + NO (g)

Solution

Cu^2+ (aq) + HNO2 (aq) = Cu^2+ (aq) + NO (g)

here copper oxidation number is no change

       R.H.R                                                                O. H.R

Cu^2+ (aq) --------------> Cu^2+ (aq)                      HNO2 (aq) --------------------------> NO

Cu^2+ (aq) --------------> Cu^2+ (aq)                     HNO3(aq) -------------------------->