Answer: Yes A is correct
Step-by-step explanation:
Multiply the first equation by 3...
2x+3y=k+1 needs to be subtracted by 3x+3y=3k
which equals -x=-2k-1
Then you can multiply the equation by -1 to make them all positive. Resulting in x=2k+1
Answer: distributive
Step-by-step explanation: minus from both sides and you'll have the answer.
I'm sure you asked this 24 hours ago, but it's A.