Book Maths Puzzle Algebra

(Caculate y for which 5y2 +13y -6 > or = 0

Read Solution (Total 0)

Book Other Question

A truck full of gravel averages 38mph on the way to the job site. On the return the empty truck averages 50mph. Total travel time averages 38 min. How far is it to the job site? I am working with subtitution method for systems of equations...my problem...
x + 3y=6
y=-1/3x + 2