how do you f(x)=x+2

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You want to reflect f(x)=x+2 across the y-axis? All you have to do is replace x with -x: you would get a new function g(x) = f(-x) = -x+2. The graphs of f and g are both lines. Both graphs have the same y-intercept, (0,2), but their slopes are different. g(x) has a slope of -1 while f(x) has a slope of 1. Graph both of them together, and you'll see that their graphs are reflections of one another across the y-axis.