f(x) and g(x) function

i don't understand what this question is making for
i know that i must draw on the graph but how do i use this information to draw one:

the question is
the function f(x) is defined by f(x)=/x/ (the slashes are meant to be straight lines)
sketch the graph of y=g(x) where g(x)=2-2f(x)

i have got the answers
(-1,4)
(0,2)
(1,0)
but i am not sure they are correct