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Yes, the easiest way to test if a relation is a function is to graph it and see if, at any point, you could draw a vertical line that touches the graph in more than one place. Your particular function is a straight line so yes, it is a function.
8x8 = 64 so it is 64 (the y) 3x4 = 12 so it is 12 (the x) 64+12 is 76.
A function is an equation that gives a unique answer. A relation does not. Example: y = 3x + 1 is a function. If I give you x, you can determine y. And that y is unique to that x. So if x = 1, you know y = 4. No other of x gives y = 4 as an answer. So y = 3x + 1 is a function. Example: y = 4x2. So if I give you x = 1, y = 4. But y = 4 if I also give you x = -1. So y = 4x2 is not a function, it is a relation.
no
Y=X^2 is a function for it forms a parabola on a graph.
Yes, it is.