So, these lines are supposed to hypothetically meet, but idk what to do or how to get them to meet (look st the dots on the graph, my line suck)

Factor the polynomial by its greatest common monomial factor.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Y= a(x-3)squared-1 what is the value of a