No.
A linear relationship. Added: And a function.
It is a linear relationship between two variables.
A quadratic equation.
That's the equation.
x = 0 and y = 4
The summary equation is the formula equation. Sugar equals alcohol plus carbon dioxide. The formula is C6H12O6 which equals 2 CH3CH2OH plus 2 CO2.
That word "equals" in there makes it an equation.
A linear equation.
It is an equation of a straight line.
It is the general form of a quadratic equation.
There is no solution since the equation is inconsistent.