So y depends on x. the function f(x) = x+2 or y = x + 2 can be graphed by taking the x as an x coord, putting it in the function y=x+2 and you get the y value.
so if I do x=1
i have (1,y) as my x coord then put 1 in the function.
f(1) = 1 + 2 = 3
y = 3
and we have (1,3)
The line parallel is y=x+1 is 1 to 10 line parallel