A big box retailer has one order for 9 plants and 6 bushes with a cost of $390. There is a second order for 7 plants and 8 bushes with a cost of $400. Which system of equations can be used to determine the price of a plant, p, and the price of a bush, b? 7p+8b=3909p+6b=400 9p+6b=3907p+8b=400 7p+9b=3906p+8b=400 9p+8b=3907p+6b=400
