exam Maths Puzzle Numerical Ability

I need to solve the following systems of three equations
x+y+z=5
x-y+z=1
x-z=y+3
Thank you so very much

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exam Other Question

using the distance formula
how would u find a in the following problem
(-4,1)(a,8);d=square root of 50
Decide whether or not each equation has a circle as its graph. If it does give the center and the radius.

x^2+8x+y^2-6y+16=0

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