Question

what is the missing reason in step 8? substitution properties of multiplication mark this and return save and exit

Explanation:

To determine the missing reason in Step 8, we analyze the context (though the full proof isn’t shown, we reason about common geometric or algebraic proof steps).

Key Insight:

In many proofs (e.g., triangle congruence, algebraic simplification), substitution is used when replacing a known value or expression with an equivalent one. For example, if we know \( AB = CD \) and use \( AB \) in a formula where \( CD \) is needed, we substitute. The “properties of multiplication” (e.g., commutative, associative) apply to multiplying terms, which is less likely the missing reason here.

Answer:

substitution