функция задана формулой...

функция задана формулой y=5x-10 _______ 3 Найдите: значение х,если у=2\3значение х,если у= 3 1\3

 

у = (5х-10) / 3
1) у = 2/3                                                 2) у = 3 1/3
2/3 = (5х-10)/3                                            10/3 = (5х-10)/3
Решаем крест на крест                               Решаем крест на крест                              
6 = 3(5х-10)                                                 30 = 3(5х-10)
6 = 15х-30                                                   30 = 15х-30
15х = 36                                                      15х = 60
 х = 2,4                                                        х = 4