Answer:
2 step proof, Subtraction Property
Explanation:
This one is pretty easy if you know a shortcut. Addition, Subtraction, Multiplication, and division properties.
Think about it this way. Subtract angle 1 from QUS. Then subtract angle 2 from RUT. Knowing RUT is equal to QUS means that the differences are the same.
Don't know if this is right or not but hope this helps.
Here's my work