Answer
The following diagram is the graph of $x+y=3$.
Work Step by Step
Input two arbitrary values of x into the equation $x+y=3$ to obtain two ordered pairs.
For example:
When $x=1$, $y=2$, and thus one ordered pair would be $(1,2)$.
When $x=-1$, $y=4$, and thus another ordered pair would be $(-1,4)$.
The two points are joined together by a straight line in order to graph the equation.