exam Maths Puzzle Numerical Ability

Help me please i dont understand
2x+2/3y=-8
1/2x-1/3y=1

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exam Other Question

19+(x/2)=4

if you can i nedd help help in

-1/5d-1=12
Identify the ordered pair(s) so that it (they) is (are) not a solution(s) for 7x + 2y = 17:
(0, 2/17)
(1, 17/7)
(0.5, 27/4)
(-2, 31/2)