book Maths Puzzle Numerical Ability

Which system(s)of equations has no solution?
1. y = 3x - 1 and y = 3x + 1
2.x + y = 1 and y = -x + 3
3. y = 1.5x - 2 and y = 3/2 X + 2
4. 2X + Y = 4X + 2

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book Other Question
what is the square root of 3 square root of 72x4 divided by the square root of 2x
Help!! im stuck. simplfy the expression
(6ax^4)^2(2x)-2

I got 9a^2 x^4 but was told i was incorrect or course i also got
9a^2 x^6 so was i right the first time.?

thanks