Y=11 is a function, because a function is a set of numbers where for you only have one input for every output. In this case it is a one kt one function because there is only one output for every input. Every input results in 11, therefore this is a function.
It makes your life easier.One way is by just adding a 0 after the number.
Ex 2*10 is 20 see what I mean.
Equivalent system, equivalent systema of equations
