exam Maths Puzzle Numerical Ability

Need to simplify: the square root of (x-3)squared + (y-5)squared = square root of (x-7)squared + (y+1)squared

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exam Other Question

1.Is (5,-2) a solution of the system?
2x+6y=-2
x+2y=1

2.Is (5,-2) a solution of the system?
2x+6y=-2
2x+y=6

3.Is (2,-1) a solution of the system?
2x+6y=-2
x+2y=1

4.
I am stuck on thi one!!!
Solve for r

v=1/3pi*H^2(3r-H)