cardio and weight trainning

Short answer: Yes.
Long answer: Doing strength training while eating at a deficit will help you retain more of your lean mass (muscles and other non-fat stuff). Technically, the scale will generally not go down as quickly as if you were doing pure cardio, but you will lose a larger percentage of fat vs. muscle, and therefore will tend to change your body shape (for the better) without losing large amounts of weight. Waiting until you've reached your goal weight to put muscle back on is difficult and inefficient. In some cases, fast weight loss with no strength training can lead to normal weight obesity (aka 'skinny-fat'), which means that you are at a normal weight but have an body fat percentage that is considered obese. Better to retain your muscles and lose weight slowly than to lose large amounts of weight quickly and lose muscle mass.