exam Maths Puzzle Numerical Ability

5x-2y+z=3
3x+2y+7z=5
x+y+3z=2

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exam Other Question

Rectangular state: One side of a rectangular stage is 2 meters longer than the other. If the diagnonal is 10 meters, then what are the lenths of the sides? Please help me with this equation!
Write:
A = pi/4 as an equation in rectangular coordinates, (x,y).
Thank you, Ray