Answer
$\underline{\text{different}};$
$\underline{\text{Horizontal Line }}$
Work Step by Step
RECALL:
(i) In a one-to-one function, every x-value is paired with a unique y-value.
(ii) To know if a function is one-to-one, the Horizontal Line Test is used. If each horizontal line passes through exactly one point on the graph of the function, then the function is one-to-one.
Thus, the missing expressions in the given statement are:
$\underline{\text{different}};$
$\underline{\text{Horizontal Line }}$
