Solve the following sets of simultaneous equations.
i) x+ y = 4: 2x - 5y = 1
ii) 3x - 5y=16; x-3y=8
iii) 2x+ 3y+4= 0; x- 5y = 11
(vi) 2x - 7y = 7; 3x + y = 22
(v) 2x + y = 5; 3x-y=5
(vi) 2y - x=0; 10x + 15y = 105
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