You could not graph (y-x-2) because it has no equal sign in it. In order to graph an equation, there must be a value that the numbers and variables are equal to. (e.g. y=2x+3)
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a line graph looks like a stocks chart
The graph will have a positive slope and that means the line will graph from the lower left and will be higher on the Right.
A line graph needs an equation. x-2 and x3 are expressions: neither is an equation.
A rather random zig-zag, probably.
They will be on the horizontal x axis of the graph (look for the x-intercepts).