Answer by Hilmarz for a very similar question:
When talking about a "system of equations", you would normally expect to have two or more equations. It is quite common to have as many equations as you have variables, so in this case you should have two equations.
Pricen2: given that there is no second equation with which to solve the original equation the values of x and y could be any of great number of values.
If you knew the value of x then you would use y=3-x to find the value of y
If you knew the vlaue of y then you would use x=3-y to find the value of x
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When talking about a "system of equations", you would normally expect to have two or more equations. It is quite common to have as many equations as you have variables, so in this case you should have two equations.
There is only one equation, so it's not a system of equations.
The system is simultaneous linear equations
Simultaneous equations.
Inconsistent linear equations in two variables.