There is no such thing as a solution for a single number!
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16 = 16 is an identity, not an equation. An identity does not have solutions.
Since both positive*positive and negative*negative equal a positive number, the square root of 16 can either be +4 or -4.
x2 -y2 =16 This is an equation that describes your problem. We can write this equation as (1/16)x2 -(1/16)y2 =1 You may recognize this as the equation whose graph is a hyperbola. So there are an infinite number of solutions.
Equations: 3x-5y = 16 and xy = 7 Solutions: (7, 1) and (-5/3, -21/5)
There is only one solution to that equation. It's . . . . . x = -16