Hey! This can look pretty confusing but, don’t worry I’m here to help! I actually just studied these.
So basically you’re wanting to solve for Y. You can calculate this by cross multiplying and the answer to your question is 12.
I know how it is when you need help and you just can’t grasp something, so if you have absolutely anymore questions or concerns, post em in chat and I’ll be happy to try to answer. Have a great evening and I hope this helped! ~Brooke❤️