I'm not good with any math that is above per algebra sorry.
Answer:
Distributive property says that:

Addition property of equality:
if x = y then x+z = y+z
Division property of equality:
if x = y then 
As per the statement:
Given the equation: 
Tyra solve this equation as shown below:
1.
[Distributive property]
2.
[Addition property of equality]
3.
{Division property of equality]
Therefore, the property Tyra used in line 1 was : Distributive Property.
Its 15% because you have to divide 270 by 1800
Where is the answer choice????