## Calculus: Early Transcendentals 8th Edition

All of the functions from the family are parallel to each other with the slope of $-1$. On the figure are the members of this family for $c=-2$(blue), $c=0$(orange) and $c=1$(green)
The general equation of linear function is $$f(x)=kx+c$$ where $k$ is the slope. Any given function from this family can be rewritten as $$f(x)=-x+c$$ We see that all of these functions are parallel to each other with the slope of $-1$. On the figure are the members of this family for $c=-2$(blue), $c=0$(orange) and $c=1$(green)