Help with two questions ive been stuck on? will post pic. Solve algebraically

Question

anonymous · Answer

attachment

stefrheart · Answer

Would you like step by step help?

stefrheart · Answer

Or straight to the answer

anonymous · Answer

it doesnt matter. ive been doing this all day any nobody has been helping so ill take anything haha

anonymous · Answer

i dont know what those little empty boxes mean?

stefrheart · Answer

hahaha its really up to you like i will take the time to explain it to you but if you dont want an explanation thats fine with me
also which boxes?

anonymous · Answer

OMG...... wait a minute...... i know how to do these problems...i thought the z's were lil boxes

stefrheart · Answer

hahaha are you olkay then?

anonymous · Answer

can you tell me if my answer is correct if i do them right now quick?

stefrheart · Answer

take your time i will be back in 10 minutes

anonymous · Answer

first one is (1,0,4) second is (3,0,1) @stefrheart

stefrheart · Answer

correct! :)

anonymous · Answer

thank you!!

stefrheart · Answer

welcome!