The given equations are
y = x ...(i)
3y = x ...(ii)
x+y = 8 ...(iii)
The two points satisfying (i) can be listed in a table as,
The two points satisfying (ii) can be listed in a table as,
The two points satisfying (iii) can be listed in a table as,
Now, the graph of equations (i), (ii) and (iii) can be drawn as,
It is seen that coordinates of the obtained triangle are A(0, 0), B(4, 4), C(6, 2).