Answer: (6, -1)
Step-by-step explanation:
Plug each pair in:
3(6)+7(-1)=11
11=11
True, so the first pair works.
Answer:

If you need a simplified fraction then 
Answer:
19/20 that's simplified by the way... and if you want the decimal form it's 0.95
Answer:60 is the common denominator
Step-by-step explanation: