Problem
PROBLEMS (5) Choose the best description of the relation sho below: \[ \{(2,10),(4,15),(6,20),(8,25)\} \] (A) The relation is a function because every input has exactly one output (B) The relation is a function because every output has exactly one input (C) The relation is not a function because every input is different. (D) It is impossible to tell if the relation is a function without knowing more coordinates.
Solution
Step 1 ：Check input-output pairs
Step 2 ：Each input has one output
Step 3 ：Relation is function
