Answer:
The answer is 12.
Step-by-step explanation:
I cant answer that, I dont know why????! I usually do!!
If the lines were parallel they would have the same slope. if the lines were perpendicular then the slope would be the negative reciprocal slope. The answer to your question would be -3/7.
Answer: The difference is,

Step-by-step explanation:
Given expression is,

By distributive property,

Combine like terms( that have the same variables and powers ),

Which is the required result.
Hence, option third is correct.