Answer:
4
Step-by-step explanation:
If she makes 4 sandwiches, she splits the 4 sandwiches among 8 children. 4/8 is 1/2 which is half a sandwich for everyone.
Answer:
OPTION A: 
Step-by-step explanation:
We should know that:

So, 

This is equivalent to 
Hence, OPTION A is the answer.
The ordered pair (2,7), is not a solution to the equation
Answer:
-5y
Step-by-step explanation:
= y if x > 0
-5
= -5y