The following is a system of two linear equations in two variables. $$\left\{\begin{aligned}
x+y &=1 \\
2 x+2 y &=2
\end{aligned}\right.$$
The graph of the first equation is the same as the graph of the second equation, so the system has ___ ____ solutions. We express these solutions by writing $$x=t$$ $$y=$$_______
where $t$ is any real number. Some of the solutions of this system are (1,_____) (-3, ____), and (5, _____)_.