What is the justification that C'=F in step 2?

Alake near the arctic circle is covered by a sheet of ice during the cold winter months. when spring arrives, the ice starts to melt. s(t) models the ice sheet's thickness (in meters) as a function of time tt (in weeks). s(t)=-0.25t+4

How do you determine if an ordered pair is a solution to a given equation?

Pls never taught i’m really confused and i rlly need