exam Maths Puzzle Numerical Ability

i need help to simplify this problem

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4x^2 | x^5y^2

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| 2xy

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exam Other Question

I do not understand how to solve systems of linear equations in three variables.

Could someone please explain how I would solve this problem

x+y-z=-1
-4x+-y+2z=-7
2x+-2y+-5z=7 3x-6y=9
x-2y=3

I am supposed to solve and graph.
6y=9+3x
y=9+3x/6
y=9/6+3x/6
y=-1/5+0/5
confused where to go, once I figure the top solution, I know that I need to plug i