Basically all you’re doing is plugging in the inputs to the equations and see if they’re correct.
5(3)+4(-3)=3 this proves to be true
2(3)-5(-3)=21 not 19

Hope you could understand.
If you have any query, feel free to ask.
Answer:
C
Step-by-step explanation:
Answer: pic of the question?
Step-by-step explanation: