1. x + y = 19 and y = 3x - 1
2. 3x + y = 19 and 2x - y = 6
3. 3x - 4y = 2 and y = 2x + 1
4. 2x - 5y = 12 and y = -2
5. x + 6y and x - 3y = 8
6. 2x + 3y = -2 and 3x - 2y = 23
7. 7x - 9y = 29 and 7x + 2y = -15
8. -8x - 10y = 20 and -2x - 6y = -4
9. -7x + 6y = 29 and 10x + y = 16
10. -6x + 6y = 0 and 9x - 8y = 4
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