exam Maths Puzzle Numerical Ability

Which system of equations has no solution?
3x+6y=-6
3x-6y=-6
3x+6y=-6
9x+18y=-18
3x+6y=-6
3x+6y=-7
3x+6y=-6
5x-4y+-7

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exam Other Question

A person took around 40 acetaminophen tablets a few minutes ago. If you know that 2 tablets contain 160 milligrams how many miligrams were swallowed? tutor could you help me please?

If x=3 and y=2, then 4x+3y/x-y =??

Thank you verymuch for your help!!!