The Writing Emporium sells pencils and pens individually. Alana buys a pencil
and two pens for 1.10 dollars. Jeffrey buys two pencils and a pen for 1.00 dollars. How
much does Edward spend to buy six pencils and six pens from the Writing
Emporium?
l + 2p =110
2l + p =100 l = pencil (as in pencil lead)
add these two equations together to get
3l + 3p = 210 multiply the entire equation by 2
6 l + 6 p = 420 answer is $4.20