حلّ نظام المعادلات التالي:

(1) 4x + 2y = 10
7x + 6y = -5

(2) 5x + 3y = 61
2x + 4y = 44

(3) 6x + 8y = 126
9x + 7y = 144

(4) 8x + 5y = -73
3x + 9y = -63

(5) 3x + 9y = 21
8x + 6y = -34

(6) 9x + 4y = -31
5x + 7y = -22

(7) 4x + 5y = -40
7x + 3y = -47

(8) 6x + 2y = 26
2x + 8y = 16

(9) 8x + 3y = 77
9x + 5y = 98

(10) 4x + 6y = 6
7x + 8y = 23