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X+Y =3 => y= 3-x now put x= 1,2,3 one by one you will get y = 2, 1 , 0 now the points are (1,2) ; (2,1);(3,0) plot them on the graph you will get a straight line similarly find the coordinates of second line and plot them on graph the coordinate of the interesting points are the value of x and y
You will get the answer

hope i helped u:)