A worker is installing blue and white square tiles in a kitchen. Blue tiles have different lengths than white tiles. A row of 8 blue tiles and 16 white tiles has a length of 39 inches. A row of 40 blue tiles and 8 white tiles has a length of 42 inches. Enter a system of equations that represents in inches the relationship between the length x of a blue tile and the length y of a while tile. Is the scale of the graph too large or small? Determine the exact lengths of the blue and white tiles. Complete the explanation for how you determined your answer and how you know your answer is reasonable.