Answer:
A. 17in
Step-by-step explanation:
Answer:


Step-by-step explanation:
Look at the second equation.
Add 6y to both sides:

Hence,

Substitute this into first equation:



Since y = -x,

I'd say neither because 5.82-4.21 equals to 1.61, and it does not go above 2 as an overestimate. In addition, it's not an underestimate because 1.61 rounds up to 2. If you can't put that as an answer, you can say its an underestimate because it does not meet the real standards of being 2.