You can put this solution on YOUR website! To be able to solve it by graohing you need to first put them in slope-intercept form;
x+y=3
y=-x+3
x+y=-1
y=-x-1
Now that you ahve them in slope-intercept form you can begin solving;
For the first equation the y-intercept is going to be 3, so from there with the slope of -, you move down one unit and to to the right one;
Equation 2;
y=-x-1
Your y-intercept is -1, so you move down one unit and to the right one,
=)
(