Answer:
A
Step-by-step explanation:
Here is how you would set it up...
You would to 12/100 = x/2 and cross multiply and solve by division. I believe. I'm almost positive that's how you do it. If that don't work out, comment and I'll respond.
Answer:

Step-by-step explanation:
Distribute the 4

Subtract the 7

Subtract y and add 1