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Amarathon runner jogging at a constant speed for 45 minutes is it proportional to time or not

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]

Can someone me and plz do the problem