jika (a-7,2a+1)merupakan penyelesaian persamaan 4x-3y=-41,nilai 2a adalah a.31 b.40 c.41

(a-7, 2a+1)  <---> 4x - 3y = -41
                            4(a-7) - 3(2a +1) = -41
                            4a -28 - 6a - 3 = -41
                                    4a - 6a = -41 +28 +3
                                          -2a = -10
                                             a = -10/-2
                                             a = 5
nilai 2a = 2.5 = 10