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?

9p +6b = 390
7p + 8b = 400

9p + 8b = 390
7p + 6b = 400

7p + 8b = 390
9p + 6b = 400

7p +95 = 390
6p+8b = 400