Question

......... my algebra....

Answer 1

Function ⇒ one input must match only to one output.

Scenario A has exactly one output for every input (✓ is a function)

Scenario B has 2 output for input "70" ( ✕ not a function)

Answer: Scenario A

Answer 2

The graph represents a function but the table does not. The reason for this is that one input value (70) in the table is associated with two output values (54.6 and 53.11), which is a sure sign that we do NOT have a function here.