Is these questions an expression, equation or an function Graphs and Linear Functions

Question

2y=4x-6,      8xyz,  y=5,        x=-4                 each one of these represent what.

Need to know what these represent

Answer 1

Hmm, the expression is 8xyz because there is no equal sign. 

The other three:

2y = 4x-6
y = 5
x = -4

All three of the above are equations, but they are also linear functions as well, because there are no exponents on the x or y variables. For example,
2y = 4x² -6 is not  linear.

The way you used the term "Function Graph" is ambiguous to me. Usually a function is just a function, and you can decide to graph it or not. So for every function, there can be a function graph.

As a rule, I would only look at something and say "yeah, that's a function graph" if it was literally a graph of a function, i.e. you can see the x and y axis, and there are points, lines, and/or curves plotted on it. 

As a side note, if you go to www.WolframAlpha.com, you can type in any equation/function and it will graph it for you so you can see what it really looks like in graph form.