exam Maths Puzzle Numerical Ability

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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exam Other Question

1) y+2=5/3 (x+6)

2) y+3=-5 (x+1)

3) y-1=5/6 (x-4)
I need to solve the following

-x/5=-3