A because one input can have only one output
Answer:
2.5
Step-by-step explanation:
Answer: 2n
Step-by-step explanation:
Silvia is n, sister is n, total is n+n=2n.
Answer:
A
Step-by-step explanation:
Those two lines are the same. If you divide the second equation by 2, you will end up with the first equation. A system of linear equations cannot have two of the same line.