The equation of the line that goes through the point (6, 7) and is parallel to the line 2x + 4y = 5 can be written in the form y = mx + b

where m is:

and where b is:

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! )