HALP!!!

Which graph best represents an increasing function?

I know what functions, slope, and all that is but I thought that a non-linear slope was not a function, so I'm kinda confused plz help me fast!

HALP Which graph best represents an increasing function I know what functions slope and all that is but I thought that a nonlinear slope was not a function so I class=
HALP Which graph best represents an increasing function I know what functions slope and all that is but I thought that a nonlinear slope was not a function so I class=
HALP Which graph best represents an increasing function I know what functions slope and all that is but I thought that a nonlinear slope was not a function so I class=
HALP Which graph best represents an increasing function I know what functions slope and all that is but I thought that a nonlinear slope was not a function so I class=