Solve the following system of equations:

(1) 6x + 8y = 22
8x + 3y = 60

(2) 5x + 7y = -59
7x + 2y = -67

(3) 9x + 9y = -27
4x + 4y = -12

(4) 3x + 6y = -36
2x + 5y = -27

(5) 9x + 4y = 31
7x + 8y = 29

(6) 8x + 6y = 100
2x + 9y = 70

(7) 3x + 5y = 17
4x + 7y = 24

(8) 6x + 3y = 21
5x + 2y = 14

(9) 5x + 2y = 41
6x + 8y = 38

(10) 3x + 3y = 6
8x + 4y = 28