Q: An equation that describes a function?

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You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.

The set of all values of x, for which the equation is true is the domain of the function defined by that equation.

A logarithmic equation would be any equation that includes the log function.

The equation for a circle is a function in that it can be graphed and charted. One common equation is x^2 + y^2 = r^2.

True

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mathematical equation

A function.

A linear function is a function, or equation, that when graphed, will form a straight line.

The official definition for the word wave function is "a function that satisfies a wave equation and describes the properties of a wave."

tan (0) = opposite/adjacent

sin(0) = opposite/hypotenuse

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I don't think there is a special name for that. Note that not all functions can be described by a single equation - at least, not in a natural way. For example, a function may be described by parts.

It is an equation in two variables, c and g.

You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.

No. By definition, a function has a single unique value for every value passed into it. The equation given here describes a circle, which can not be rearranged to meet this condition.

A linear equation describes a line like 2x+1=y. If you were to graph that equation, then it would give you a line. A quadratic equation is like x^2+2x+1=y. Graphing this equation would give you a U shaped graph called a parabola.