6-2+9a-4a+a+7
PLEASEE HELP THIS IS URGENT pelas helppp

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Pls , the question is in the picture!

Which is the graph of the piecewise function f(x)? f(x)=[tex]f(x) = \left \{ {{-x+1, x\leq 0 } \atop {x+1, x\ \textgreater \ 0}} \right.[/tex]