a store mixes kentucky blue grass worth $11 per pound and ryegrass worth $14 per pound. the mixture is to sell for $13 per pound. How much of each should be used to make a 204 pound mixture?

let x=# of pounds of bluegrass

let 204-x=# of pounds of ryegrass

11(x)+14(204-x)=13(204)

11x+2856-14x=2652

-3x+2856=2652

-3x=2652-2856

-3x=-204

x=68 pounds of bluegrass

204-68=136 pounds of ryegrass

check:11(68)+14(136)=748+1904=$2652

13(204)=$2652