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See y=x will be a straight line passing through origin at an angle of 45 degree from the x-axis
and y=-x will be a line passing through origin with 135degrees from the x asis and their point of intersection will be the origin and graph will be like X and intersection point as 0,0
0 0 0
If we try to solve both the equations by substituting y=0,1,-1 then, both the graphs meet/intersect on the origin  only.
Therefore, the point is (0,0)
0 0 0
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