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I don't see any 'equals' sign ( = ) there. Without that, you have only an expression,
not an equation, and it has no graph, so you don't have to worry about it.
By substitution
The solution is the coordinates of the point where the graphs of the equations intersect.
The equation does not have and y variable in it: it is of the form x = c. Alternatively, the x coordinates of both points are the same and the y coordinates are not.
There are many uses for graphing. One use is to determine if a child is on target for his/her weight and height. It is also a good visual when trying to figure out if a value of stock is going up or down.
2d means 2 dimensional or flat figures. If you are dealing with algebra or graphing, it would mean X and Y coordinates only, not Z.