Hello, and thank you for your help. I have been doing this all day, and I cannot get the right answer for the life of me. All other 70 questions I was able to solve. Somehow I am missing it on these. Please show me how you did your work. I do not have to show the work, but I would like to learn and see what I did wrong. God bless.

1. 0.05X + 0.25Y = 66

0.15X + 0.05Y = 72

2. 0.3X - 0.2Y = 4

0.5X + 0.3Y = 1

3. 9x-9y = 9

7y-3x = -5