Need for $7.90 you purchased 8 total items ( pens and highlighters) from a local bookstore. each highlighter cost $1.09 and each pen cost $.68.write a system of equations that can be used to find how many of each you bought a) 8p+8h=7.90 and 1.09 + .68 = 7.90 b) h+p=8 and .68 + 1.09p=7.90c) p+h= 7.90 and .68 + 1.09h=8d) h+p =8 and 1.09 + .68p = 7.90