This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
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
Solve the equations and the plot the values on a graph paper ,u will get two intersecting straight lines...n thus the values of x co-ordinate and y co-ordinate respectively at the point of intersection.
hope i helped u:)